not to go super powerlevel/TMI, but I can speak from experience and say I think it's some kind of OCD or severe anxiety disorder. I've had intensely negative thought loops where all I could think about was murdering pedophiles and I'd rant about it constantly before I went to therapy and got put on antidepressants. I think on some level it contributes to his alcoholism as he probably turns to the bottle to stop thinking about sickos. He may also just be a low functioning retard who gets sent thousands of text messages a day by unfunny spergs just to fuck with him. Could be either or, I'm not a psychiatrist.