Some trolls are harmless and just do it to be funny I think. Some are angry, bitter, and bored people who get a kick out of being annoying and seeing how people react. And some are just immature, stupid, and lack creativity. I do think there could be an anti-social trend, but I’m not really well read on this or have given it much thought. Seems you’d have to be totally friendless and reclusive to make a living out of being an annoying internet troll. Who else even has time to bother with it?