There isn't much people can do when some Twitter mob starts harassing them either. They openly coordinate capaigns to ruin people's lives, dump personal information and pictures, call companies to demand that people be fired, apply pressure on sponsors and advertisers. Coordinated efforts to hurt some enemy as much as possible without actually resorting to physical violence.

If you have examples of such people getting banned or arrested, feel free to post them. I've seen numerous examples to the contrary over the years to the point it turned into a neat little collection.