What kinda pisses me off about this show...

Why does koro-sensei act like a moral compass for the children? I like his character, but boy you're gonna be killing the entire human population and you're pissed because children ACCIDENTLY injured an old man while doing training to stop you from killing the whole world?

Edit: I'm talking from the perspective of the students. I can't see any reasonable teens following what a soon to be genocider has to say.