Generally because Creationists do not grasp Evolution. If they did they would become Evolutionists.
Exactly. They refuse to even consider the concept of evolution because of their never ending fear of death, but accept even the most ridiculous aspects of their religion as absolute truth, with no evidence. I have had to hear that 'I don't believe we evolved from monkeys' crap constantly, which the churchs feed them to make sure they stay dumbed down.
The thing that infuriates me the most if when they say, 'No one has ever observed evolution happening, so it can't be proven'. Beyond the fact that that statement is inaccurate, what do you accept Noah's Ark or the Tower of Babel? Did you observe those events? One again: A fear of hell and a longing for heaven.