You see, once you acknowledge that evolution works for everything biological. The next step is too assume that all human behavior, whether a result of biology, or society can be explained and thus has no basis for free will. You see free will would require things too just happen for no reason what so ever. Be uncaused causations, if they weren't the choice wasn't really yours too start with. It was the result of your biological instincts and learned behavior. True free will, can not exist in a universe...