It begs the question - is the continual, daily expression online of hatred of specific celebrities or people in the news, spreading propaganda and lies (such as photoshopped pics etc) about individuals on a very regular basis and trolling generally a mental illness or at least a symptom of one?
In the main, no. It's a 21st century version of Angry from Wealdstone, except it's infinitely more accessible. Was Angry from Wealdstone 'nutty', or just misguided / interested / frustrated / jealous / lacking other outlets? Probably. What's important to one is irrelevant to another.
There will be some total cranks interested in all manner of subjects, some of whom just have a pathological hatred of their chosen bete noire. For example, I hate Davros with an irrational disdain that's incalculable. He's my arch-nemesis; my itchy to his scratchy. Like those two dudes on Highlander, kicking each other's arses throughout time first with a rock or something, then with a tazer in a small flat above a Nisa store in Croyden.
Some people hate Gerry and Kate McCann - they're not all mad, not......all.......mad.......not.....all....m