There's advocating genocide, and shooting people on sight in an older comment.
I understand you're not the person that killed the comment, but could the commenter have expressed either of those points of view in a way that wouldn't have resulted in them being removed? If not, I think that's unfortunate. We're adults here and should be able to handle genuine conversation on sensitive topics, I would hope.
Valuing them above what? There are probably not very many people on this planet that can truly claim to value all human life equally and above everything else.
So self-defense / death alone are not enough to flag a comment. Political movements like ELF (Earth Liberation Front) used arguments similar to mine on why, for example, coal plants are legitimate targets in self defense.