in 8 mile, eminem says "put that shit down before you kill someone!" as both gangs were fighting.
same with mma- like all of this is couched in respect of the rules and fair play.
in another way, why spend years to compete in a fight when you could just shoot and kill them? because the end goal isn't to hurt them- it's to show them who is the best at the game. it's all about the game. the virtue- not actually pain.
and thus it is positive in a way- cause it's all coming from a place of morality.