unpleasant people being unpleasant to other unpleasant people - honestly, was the audience supposed to care who lived and died?
you mean the godfather? reservoir dogs, any western movie, any gangster movie, dirty harry etc...im not sure that making movies about pleasant people being pleasant to others would be interesting to watch
im confused tho, what exactly are mainstream movies? and what movies are you specifically referring to? The list of movies given seems a bit vague to make any conclusion