> you should also ask why this is being debated so widely in the first place

Because there are lots of wars burning all over the planet. We tried to carve an exception into international law, after WWII, about it being permissible to intervene in the internal affairs of another sovereign state if they're doing genocide. So this is a real debate that should be had. The problem is by practically every definition, there are at least a handful of active genocides happening in multiple theaters around the world.

The abhorrence of genocide is one that needs to be refreshed with action if we're to restore the norm that it's not okay. But to do that, you have to set the new threshold.