Rorschach was an ass. He was basically a monster. That refusal to remain silent in the face of overwhelming horror makes him a hero.

Ozymandias should have been brought to justice for the murders he committed. He should have been publicly broken, the people he killed or caused to be killed tied to his actions, and his horrible scheme made public to everyone on Earth.

The only hero is Rorschach. He's still a horrible human being.