Anonymous (ID: 558a45) No.398706
Some people lens the world in a zero-sum frame, where one group's gain is automatically a loss for all the rest. It's a belief that someone will inevitably be genocided eventually, and so if it has to be anyone, better them than us.
Others have an equally cartoonish dualism, where there are those who want no one at all to be genocided, and on the other end of the spectrum, there's everyone who wants anyone genocided, with the implication that once "the genociders" finish off one group, they'll just infinitely move on to the next, until no other group remains alive.
If you're in the second group, you might fear that if another group gets targeted for genocide, yours will be targeted later at some point in the future, and so you must stand in league with the anti-genocidal to mutually protect each other. So it's deterrence. They don't want to be killed themselves, thus no one must ever be killed.
Is this correct? I don't know. Both are extreme caricatures. It's also a fallacy to assume the real answer is just the midpoint between extreme caricatures.
There's your straight answer. Now go away.