Dunno why I put ...sides...last time,!       Anyway, it certainly is possible for evolutionism to lead to errant behaviour. For example , even Gould confessed that there had always been racism but that with Darwin thought it had increased by order of magnitude. There have been many examples.    The nazis proclaimed that they had sinned against natural selection (meaning evolution in context) by allowing the unfit to live.    And , to make it clear, I am not saying that atheists cannot be moral , but that they have no objective basis for morality. However , this also means that the goalposts can keep moving as has happened with the acceptance of abortion for just about any reason.   And certainly many atheists on here are of the opinion that the woman's choice is the sole consideration.