Part of the point (in the context Miche and I were discussing this in) was that there are differences that may mean two people can't be close friends, maybe won't even enjoy spending time together, but that don't mean there's something wrong with one of them. Also that I can be firmly convinced that someone is mistaken on a policy issue where the decision will affect my life and theirs (say, how the government should spend transportation funds) without believing them to be either evil or insane.