Why Do Smart People Make Bad Decisions?

In 1961, the United States launched the Bay of Pigs invasion. The plan had been examined by highly educated, experienced people. It failed spectacularly.

Three years later, another group of exceptionally capable people sat around a table discussing how to respond to the growing crisis in Vietnam. History would later question many of those decisions too.

The uncomfortable lesson?

Bad decisions aren’t necessarily caused by stupid people. Sometimes, they’re caused by smart people thinking together in the wrong way.

We like to believe intelligence makes us rational. Psychology suggests otherwise.

Daniel Kahneman and Amos Tversky’s pioneering work on cognitive biases demonstrated how human judgment can be systematically influenced by shortcuts, assumptions and framing.

We don’t always analyse. We often recognise, assume and react. And the more experienced we become, the easier it can be to trust our instincts. That is useful — until the situation changes.

Experience can become an advantage or a blind spot. The very thing that made someone successful yesterday can sometimes prevent them from seeing what is happening today.

Imagine a senior leader proposes an idea. Everyone knows she is experienced. Someone disagrees — but instead of challenging the idea, the room becomes quiet.

A second person notices the silence. A third thinks: “Everyone else seems to agree.”

Soon, nobody is really evaluating the decision. They’re evaluating everyone else’s reaction to the decision.

Psychologist Irving Janis called this phenomenon groupthink — the tendency of cohesive groups to prioritise agreement over critical evaluation.

Consensus starts looking like evidence. It isn’t.

The Challenger space shuttle disaster is one of the most studied examples of organisational decision-making failure. The technical concerns were not completely invisible. Warnings existed.

But communication, organisational pressures and assumptions about acceptable risk contributed to a decision that ended in catastrophe.

Similarly, before the 2008 financial crisis, sophisticated financial institutions employed some of the world’s most highly educated professionals. The problem wasn’t a lack of intelligence. It was a combination of incentives, assumptions, models and collective confidence.

History repeatedly gives us the same warning: people rarely make bad decisions because they deliberately choose failure. They make them because, at the time, the decision appears reasonable.

Try five uncomfortable questions:

One of the simplest techniques is also one of the most powerful: give the dissenting view a voice before the decision is final.

Not because dissent is always correct. Because it forces the group to examine what agreement may be hiding.

That’s impossible. Leaders will always make decisions with incomplete information. The goal is something more realistic:

Build a culture where being wrong is easier to discover.

A psychologically safe team should allow someone to say: “I don’t think this will work.”

A strong leader shouldn’t hear that as disloyalty. They should hear: “Someone is helping us see what we might be missing.”

As Kahneman’s Thinking, Fast and Slow reminds us, our minds are remarkably capable — and remarkably prone to predictable errors.

So perhaps the smartest person in the room isn’t the one who always has the answer. Perhaps it is the person willing to ask: