Moral beliefs are incompatible with the precept of survival of the fittest, therefore, survival of the fittest can never generate any moral beliefs.

Where have we seen this before? We gotta get rid of Saddam Hussein otherwise he will be flinging weapons of mass destruction all over the place.

I think I've touched on this before, but this is akin to threatening one with the thought of burning in hell for eternity for having the audacity to question the existence of God. It is the attempt to scare one into believing that your way is the only way and that there are dire consequences for believing otherwise. This is like a child molestor who threatens to hurt his victims even more if they tell their parents about what he's done to them.