Not one person likes to be wrong about the choices we make. That's human nature. Some individuals have a need to defend these choices to death, even when faced with greater realities that negate anything they could possibly say about their choice. I remember one guy who would show-up at these professional meetings around the time the iPhone came out. He would make it a point to go around the room and tell everyone th…
The "pain" of insecurity balances over-confidence to help us find locally-optimal decision points. Like with other types of pain, the usefulness of it in some situations can get misdirected and misused pretty easily now that we're out of the jungles and not interacting with each other face-to-face. The anonymity of the Internet is so different from early human encounters that we have a lot of trouble dealing with it.
> Just remember that all nearly all great discoveries stemmed from questioning what the majority took to be the truth
Then again, a lot of sheep die by straying from the herd and getting picked off by predators. Like most things, cutting the balance the right way and making the best decisions at the right time is really really hard.
If it were easy, lots of animals would be competing with us for dominance of the earth.