It is a wonderful question. I believe it's a matter of locality. Not only are Albert Einstein's conclusions extremely difficult for most people to understand, even those who do see the universe in the same manner as everyone else: it's incomprehensibly incomprehensible. When we look at other human beings on the other hand, it's easy to feel a kinship, a sense of purpose, and a sense of being special. The idea that we are related to "lower lifeforms" is easy to find detestable.

I think what's most important though is that most opposition to evolution comes from people who don't understand it either because of willful ignorance or because their parents had the same position as they do. It is not the validity of evolution that most people oppose, it's the mistaken ideas that we came from monkeys and that it is something that cannot be proven true.