I don't think this necessarily applies to everyone, but the pressure to want to save face is pretty strong for most people.I know in my case if i change my mind, ill just say so. In fact, sometimes in a debate, if i said something that was a mistake, i HAVE said it was a mistake and i give them the point.
I have ZERO problem being honest. I can EASILY go from DIE HEART view on one thing and then BANG! Switch immediately if i get that epepheny. I dont have a problem with it.
Personally, one of the things I like about identifying as a skeptic is that it flips this on its head: by making part of my identity about a willingness to correct any wrong belief I hold, I can actually save face by correcting myself and lose face by obstinately holding on to a bad position.