i also want to add this one. rin was everything to obito. i cant remember anywhere in the manga if obito had a family. i cant even tell if obito had friends other than rin. the only people who cared about him was minato, rin, and later on kakashi. so this makes sense, losing the only person you ever cared about. how would that affect you? how would you handle the world as it is right now if the most important person in your life was taken away? would being good or bad still matter to you? i dont know, but obito is what he is right now.