You start out by making relatively innocent jokes about jews, and notice that certain portions of the anglosphere left and right really respond to this. Not only do they tell you that you can't say that, they also shower you with threats of violence. Successful troll is successful. So you go a bit further, start moving into actual anti-semitic jokes, conspiracies. Still just for the lulz, but it gets an even better reaction. Meanwhile, your image board/irc buddies, the only people in your life who treat you like a real human being, keep egging you, some of them pointing to the reactions you're getting as proof that there's some kind of underlying truth behind the jokes. "Yeah, sure, the protocols of the elders of zion isn't real, but look at the reactions you're getting for what amounts to lazy trolling! And from people with actual power - political power, media power, financial power..."

I think you can see where it goes from here - the road to hell isn't always paved with good intentions, but when turning around means accepting that the people who hate you are right, what are you going to do?