That's what scares me.
Have you ever considered that Adolf Hitler was just a logical atheist with some power? He was horribly wrong, in a way that gives new meaning to the phrase horribly wrong, but if you believe evolution is real then he was only taking his beliefs to their logical conclusion. Why would you want to protect the weak? That is bad for the species.
Those who claim to be atheists, but want everybody to love everybody and the whole world to be nice and soft, those are the really conflicted people. What they want goes directly against what they believe.