i'm gonna assume in some cases it's the same mechanism that makes someone racist or sexist or prejudiced. they aren't always solidly-backed arguments. they don't typically make sense to others. people have things ranked in their head (good/bad), and sometimes that ranking, once set, won't change for anything. no amount of proof or explanation or debate will change their mind. perhaps it's some animal instinct... the desire to be right, and unwilling to change views because it's a sign of weakness.
of course, GMi members are exempt from this school of thought
personally, i love being enlightened. i generally have a point of view, but often find it changes with discussion. not for the sake of changing it, but i typically get my mind set and it doesn't occur to me to think about any other points of view. this message board is a good example... i find i often look back at what i wrote and wonder why i didn't consider other points people have brought up.
of course, GMi members are exempt from this school of thought
personally, i love being enlightened. i generally have a point of view, but often find it changes with discussion. not for the sake of changing it, but i typically get my mind set and it doesn't occur to me to think about any other points of view. this message board is a good example... i find i often look back at what i wrote and wonder why i didn't consider other points people have brought up.