I always wonder how they look at the evidence and convince themselves it isn't true. I think I'd go insane

Easy. The scientific process used in dating and in the theory of evolution is laughable at best. If the same principals that are used in carbon dating or other techniques used to prove evolution were used in the field of medicine, we'd be lucky if we survived taking asprin. Evolution was a desperate attemp to remove God from the picture, and it worked. So now that we're not under the restrains of religion, why do we still hold on to a theory that requires THE SAME AMOUNT of faith that creationism does? I for one don't like the two choices that I've been given. And until one comes along that is actually a fact, and not a theory, I'll just have to say 'I don't know'