You’re right. It isn’t about proving something with science. It’s about the community. In this community you always hear the same things over and over again, so if you start questioning your beliefs you also have to question all this “evidence” you saw. You have to question all your beliefs. The beliefs that you defended in the Internet and real life against other people. Doing so can cause an “existential crisis”. It isn’t comfortable to question yourself. Humans don’t like change, so they won’t question anything and hold onto their beliefs, since it’s easy. Also all the people always positively engage with each other so breaking with your beliefs also means breaking with your social circle.