I think there's a misunderstanding over the difference between "legally right" and "morally right" within the community because this "hot take" has practically taken over in the Red Dead topic on social media.
He acts in a way that suggests that he has lost something from a gang of outlaws and takes it too personally when he deals with the gang. I mean he killed Mac in a pretty gruesome way and maybe did some things that weren't within the boundries of the law.
He was doing his job, he had the "I'm gonna do whatever I can to get these bastards" personality, he did his job but he was a little evil, but he did his job