Why is Nagito Komaeda so hated ?

I don't hate him but I think I know why. Most peminat-peminat are hating on him because of his actions in the game. He made things worse sejak triggering the killings and being an obstacle on some of the trials, although most times he has proven to be quite useful. Honestly, most DR peminat-peminat I have come across hated him before playing the game but after that, he started to grow on them. Personally, I wouldn't say he is one of my kegemaran characters in the series but I still like like him. anda gotta Cinta the insane ones !!!!