Hate is the goal of the manipulator. People need to be manipulated to hate.

That's an interesting take, but I disagree, but perhaps not fully.

I think most people want the manipulation to be there, because then they have a "permission" to hate - "it wasn't me, it was the manipulator!" But people should take ownership of their decisions.

I actually think it goes even further than that. Most people want to be manipulated, in one way or another. Some people want to be manipulated by the hate-mongers, and some want to be judged by the love-mongers.
So what you judge people by is not whether they are manipulated or not, but what it is they choose to be manipulated by.

As for hate's goal? It's to make you feel closer to others, ironically. Some just find it easiest to feel closer to others by painting those they are unlike.