Playing cowboys and Indians when we were kids is not even slightly akin to playing ultra violent graphic video games and the like. No comparison.
Well, to one who insists on looking through gospel eyes, one can see deficiencies in both paradigms. Not all Indians were evil; not all cowboys were good. Stereotypes invite the conflation of ultimate good and evil with their dwelling places among men.
At least some cowboy vs. Indian battles were to the good, however. None of this stuff based on stealing could be to the good. (Now if it was a Repo Man theme that might be better. Just as an idea to toss out there.)