I think this is very well stated and I'd like to see this idea presented more frequently in dialogue surrounding internet zealotry.
Simply put, a great deal of what drives the extremist behavior on the internet is straight up narcissism. The people participating in pile-on internet bullying campaigns feel good about themselves when they do so, and receive praise (from the internet mob that they have aligned with) for doing so.
Post anything online and there's a chance you'll be someone's next fix.