Nazis have racist views of Jews. Proggies have racist views of whites. These are of course completely different, which is why the Nazis will destroy/save us all. Yes, I just noticed. I got to wondering if it was a coincidence, and it's not. I can't explain it mechanistically, though. It seems to be pure logic/magic.
Demotism is based on envy. Thing about envy is you can't have it flopping around untethered. Have to have a target. Hence, market dominant minorities. Kulaks, Jews. Or, in the proggie's case, market dominant majorities. Not merely handy, but vital. Envy is what makes it go, but there's no such thing as a sociological muffler.
Marx tried to do it with classes. If you have racially pure nations, you work with what you got. Classes aren't really that unmistakeable, though, so it's not great. Further, immigrants always have a strong vote bias, so the party they vote for always wants to import them. Skin colour: now you're cooking with gas.
Even if proggies manage to prison-camp every white, inevitably they will want to import someone of a different shade of brown. They will try to exploit the envy of the original shade of brown, and the cycle will repeat. As always, as politics approaches communism, citizens must approach equal. The envotaic force must be allowed to do work. However, we are all equal if and only if we are all dead.