That blood would be on the one that ended the life.
That being said, wonder what would lead them or anyone to be compelled to take such drastic action? Couldn't by any chance have anything to do with being rejected, ostracized, harrassed, physically attacked, told their very existence is something negative, basically being made to feel their life wasn't worth living by those given to their own extreme hatred of others that rivals the hate they bear for themselves which they try to exorcise by trying to refocus it on others?
The self-righteous tend to be a rather self-loathing lot, after all (and deservedly so), hence their desire to make others as miserable as they are themselves,,,