Most think rational thinking looks like this.
The evidence is examined with a microscope and then a smart conclusion is formed.
In fact it’s probably the opposite, we form an opinion and then look for evidence to back it up. Locking prior beliefs in a box before weighing evidence is rare, if not non-existent.
Also, I think I’m rational and everyone else isn’t. So do you and so do stupid people.
But ignoring human bias for a second, the evidence based approach makes sense.
There are domains where we have figured it all out. With enough diligence, we’ll get the right answer. Problem is, these domains are often simple and boring. People transfer this same approach to areas we haven’t figured it all out yet. It doesn’t work so well here.