The joke is that it looks like a joke but isn’t in the same way a sociopath will explain in detail exactly how they’re going to fuck you before they do knowing you won’t believe them because it’s all a joke in a joke that isn’t real.

So it's okay for people who have the power and connections to actually impact the world in the horrible ways they're "joking"about to make jokes about doing just that?

I don't think it is. What's the old saying? There's a grain of truth in every joke.