There´s a fundamental difference between sublimate the violent natural impulses we all have into harmless behaviours, like sports or works of fiction; and create a scapegoat of a particular minority, treating all their individuals as a mass that share the same traits (usually undesirable ones), like Orcs, and find reasons to justify the killing, maiming, pillaging, despising, etcetera so that doing very bad things to them makes you good because they are "Evil"
You know the saying, "if you kill a killer, the number of killers in the world remains the same"
That is why I do not particularly care about that kind of black-white morals even tho it could make a useful tool for worldbuilding. Saves you a lot of time.
