Wishful Thinking: Why We Believe What We Want to Believe
And is that always a bad thing?
Issue No. 47
Imagine you walk out of your doctor’s office with a new blood-pressure monitor and instructions to check your blood pressure every morning.
The next day, you wrap the cuff around your arm and press the button. The reading is high. You try again. Still high. You try a third time. Eventually, you get a number that feels closer to what you’d like it to be, and that’s the one you dutifully write down.
The morning after that, you wrap the cuff around your arm, press the button, and the very first reading is comfortably within range. This time you don’t press again. You record it immediately and get on with your day.
Why do we sometimes treat evidence differently depending on whether we like what it tells us? When the result suits us, we accept it instantly. When it doesn’t, we suddenly become forensic investigators, demanding more proof.
In this example, what happened can be broken down into three steps.
Motivation: You wanted your blood pressure to be normal.
Process: You applied stricter standards to unwanted evidence (maybe I wasn’t sitting right) and looser standards to wanted evidence (what are the chances the device gets it wrong?).
Outcome: You accept the desired conclusion as the true one.
Wishful thinking is how we’d characterize the motivation step. It’s the desire to believe something because we want it to be true, even when the evidence doesn’t cooperate.
Motivated reasoning explains the process and the outcome steps. Psychologists use the term to describe how we demand very little proof for conclusions we like and disproportionately high proof for those we don’t.
When confronted with threatening or uncomfortable information, we often search for explanations that feel more palatable than the obvious one.
When applied to facts, the two tendencies—wishful thinking and motivated reasoning—work together to cloud our judgments.
Here’s another example. I watched an interview the other day in which the host accused a guest of something she denied outright. When he reached into his pocket to take out his phone and play a video that would settle the matter, she turned her head away. The evidence was right there, but she didn’t want to see it.
Decomposing the thought process here as we did earlier:
Motivation: The interviewee wanted her version of events to be true.
Process: She applied stricter standards to unwanted evidence (empirical evidence from a video recording) and looser standards to wanted evidence (trust me, bro).
Outcome: She accepted the desired conclusion as the true one.
If this were a rare quirk, it would be easy to wave away. But psychologists have shown that the pattern is prevalent. Whether the topic is politics, health, money, or our own abilities, people reliably bend their standards of evidence in the direction of what they hope is true.
What the research shows
Study 1. One classic experiment1 had participants evaluate a job candidate’s intelligence based on a series of test results. Researchers created a fictitious job candidate and showed all participants the same set of test results supposedly indicating how intelligent the candidate was. The test results were deliberately ambiguous.
Before participants saw the results, the researchers subtly manipulated their motivation. Some participants were led to want the candidate to be intelligent (they were told the candidate had positive traits that would benefit them), while others were led to want the candidate to be unintelligent (they were told the candidate had traits that would disadvantage them).
After this motivational nudge, everyone evaluated the same test results and judged how strong the evidence was.
What happened was that participants accepted the conclusion they wanted to be true based on weaker evidence. Those motivated to see the candidate as intelligent thought the ambiguous test results were strong evidence of intelligence, even though the results were mediocre. And those motivated to see the candidate as unintelligent thought the same results were strong evidence of low intelligence.
When it came to the conclusion they did not want, both groups suddenly demanded much stronger evidence. The very same test scores were now seen as insufficient.
The data didn’t change, only the desired conclusion did.
Study 2. In another study in that same paper, people took what they thought was a medical test indicating whether they had a rare disease. Everyone received a borderline, ambiguous result. But when the ambiguous stripe implied bad news, participants scrutinized the test intensely—staring longer, retesting, raising objections. When it implied good news, they accepted the result almost immediately. The interpretation didn’t come from the data; it came from the direction the person hoped the data pointed.
Study 3. In another study from 2004,2 Democrats and Republicans lay in an fMRI scanner reading small contradictions about political candidates. When the inconsistency involved the other party’s candidate, the brain behaved normally. But when the contradiction involved their own side, the neural signature changed. The regions associated with calm reasoning stayed quiet. Instead, areas tied to emotional conflict lit up, as if the mind were slipping into defensive mode. And when an exculpatory explanation arrived—a line that made the contradiction go away—the brain’s reward circuits flickered as if relieved.
In a sense, when the truth hurts, the brain doesn’t call its scientist, it calls its lawyer.
Across all three studies, the pattern is the same: our preferences shape not only how we interpret evidence, but how much evidence we demand in the first place.
So wishful thinking is always bad?
Not necessarily. The same bias that bends our judgment can also be what gets big, ambitious projects off the ground. If founders only acted on what the evidence supported, many companies wouldn’t make it very far. Early data rarely gives anyone permission to believe. You have to lean on a kind of constructive self-deception. The belief that something improbable might still be worth doing.
Used this way, wishful thinking isn’t about ignoring reality; it’s about creating just enough space to act before the world agrees with you. It’s the part of the mind that says, “Yes, the odds are low, but go anyway.” Applied to facts, it trips us up. Applied to the future, it can be what pulls us forward.
I spent most of my career at Apple. And there I learned about reality distortion fields, which Gemini defines as follows.
A reality distortion field is the ability to convince oneself and others to believe that an almost impossible goal is achievable, often through charisma, passion, and persuasion. Coined by Apple’s Bud Tribble, the term originally described Steve Jobs’ talent for influencing his team to meet incredibly challenging deadlines and create groundbreaking products, even if the stated goals seemed unrealistic.
And I can personally attest to the value of jumping into something nascent with outrageous optimism. I feel it’s an essential skill for keeping our inner drive alive as we go through life.
In the end, wishful thinking is a tool the mind reaches for, sometimes to protect us from discomfort, sometimes to help us move toward something worth building. When the bias is aimed at facts, it narrows our world. When it’s aimed at the future, it widens it.
Checks to make sure it doesn’t blind you
Look for asymmetric standards. Pick a belief you hold tightly and write down what would actually count as enough evidence for you to change your mind. Maybe it’s “three independent experts I trust,” or “data from a source I can’t easily dismiss.”
Do the same for something you don’t have much of a stance on. What would you need there? A single good study? A credible explanation? A friend’s experience? Compare the two lists. If the first one reads like a legal brief and the second like a Post-it note, that gap isn’t about the topic. It’s about the threshold you’ve quietly set.3
Notice your escape hatches. When a piece of information threatens a belief you care about, pay attention to the first mental exit your mind reaches for—the study was small … the source is biased … that doesn’t apply to me … it’s probably outdated. These may all be true, but the speed with which you reach for them is revealing. Real counter-arguments take time to form. Instant ones are often just the mind protecting a preferred conclusion.
Test for directional effort. When you’re researching a topic, watch where your effort goes. Are you spending most of your time gathering evidence toward one direction and very little toward the other? If 90% of your searching is aimed at confirming rather than checking, that imbalance isn’t about the topic, it’s about what you want the answer to be. Intellectual effort should roughly match the uncertainty of the question, not the direction of your hope.
It is difficult to get a man to understand something, when his salary depends on his not understanding it.
—Upton Sinclair (I, Candidate for Governor: And How I Got Licked)
Until next time.
Be well,
Ali
P.S. Some past issues to read through in case you missed them.
https://fbaum.unc.edu/teaching/articles/jpsp-1992-Ditto.pdf
https://www.researchgate.net/publication/6727730_Neural_Bases_of_Motivated_Reasoning_An_fMRI_Study_of_Emotional_Constraints_on_Partisan_Political_Judgment_in_the_2004_US_Presidential_Election
Something I loved to daydream about when I was very young was imagining myself having a debate with someone on something I felt really strongly about. The twist was the other person would also be me. Good times.
Ali, my namesake, you are a true gem. I love how you think and explain. Thanks for your efforts.