Why is Nagito Komaeda so hated ?

I don't hate him but I think I know why. Most Fans are hating on him because of his actions in the game. He made things worse Von 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 Fans 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 Favorit characters in the series but I still like like him. Du gotta Liebe the insane ones !!!!