I think matz1's position is quite clear: there is no absolute right or wrong, and the only thing that makes "gas the kikes" unacceptable is that the majority of humans find it unacceptable and are willing to go to war to stop it from happening. If we weren't, it wouldn't be unacceptable any more.

It's almost a Poe's Law of moral relativism in general, but there's the additional step of "and therefore, I will not have opinions on right and wrong and will let others do as they please, because who am I to have moral opinions about others"—but that in itself is a moral opinion about others.