I'm not sure what they're going to do when there aren't any groups left to "other." They might have to argue for their ideas and policies on reason and merit. That's gonna be hard. It's a lot harder to convince the neocortex with reason than to rally the limbic system with outrage porn.
It's gross of course. It's using people for political cannon fodder. At least the left mostly just tries to scare me and make me hate right-wing politicians, which is like striking a military target rather than a civilian target.
I hate the culture war in general. It's a godsend to incompetent politicians. All they have to do is grunt correctly on culture war issues and they don't have to actually deliver anything of substance or solve any real problems.