Attacking people won't change their minds

I don't understand that when someone has a different opinion than somebody else, they attack them and call them names.  They tell them they're ignorant instead of trying to properly and politely educate them and then just leave it be. No matter how much you attack or educate someone it doesn't mean your going to change their opinion. Everyone is entitled to their own it's doesn't mean they hate things they don't believe in it just means that they have no personal opinion in it.