This is how some of the worst atrocities start

Start? Really? People are being murdered in plain sight without consequences. The governments of the west are collaborating In genocide against Gaza. One in four black men go through jail in the US over their lifetimes. Homelessness is rampant, people are left to die without healthcare, drug abuse skyrockets, people are left unemployed and depressed.

You don’t care about “the worst atrocities”, the worst atrocities are happening TODAY and you simply don’t care because YOU have not been affected so far.

So who is the one deciding who gets taged as oppressor?

The people, democratically, organized in worker councils. Nowadays it’s usually old men with wigs deciding who’s a criminal, and that’s clearly working like shit, we can do better easily.

Do you murder the oppressor’s children as well because they benifited from their perents behavior?

No, literally no revolution ever has done this except in politically dangerous situations where keeping royal family members alive means danger of reestablishment of monarchy (e.g. Romanov). You’re just doing fake atrocity propaganda for something that literally doesn’t happen, and ignoring the millions murdered every single year.