I'm going to try to explain this without coming across as a dick because I don't mean it that way. This is propaganda, it's meant to inspire thought. What makes it work is that it's both rediculous and also sounds a lot like something a woke warrior would say. The last line spoils that and makes it obvious that a racist wrote this and is trying to prove a point. You actually want the dumbest of the leftists to see this and agree or repeat it. The rest you want them to read it and agree until they think about it a second and realize they just got played. You want them to have that moment of "wait a second, my own sincere thoughts were really stupid just now and the author of this is making fun of me for being predictably dumb" That can't happen if you explain it for them at the end. They just read it and their only reaction is that racists are evil and they're a good person. It also makes our side look like simpletons to those on the left who use propaganda and subversion to sway minds. (kikes, basically) Think about how you saw jewish subversion before you had it explained to you. Like most people you barely noticed it, right? That's because it used subtlety. But it still worked, right? I hope this makes sense.