They do it purely for the reactions.. It's why the mods/admins don't bite when a troll appears and we just remove them..
The best defence is to just put them on ignore and you then take away all of their power and they're left looking like the idiots they are.
It is though very interesting to anyone who runs an internet site that allows posts/comments/submissions from the public as to how far the law is now prepared to go in recognizing abuse like this
