I am posting this question just out of curiosity. I don't support any side of the aisle of the answers it may receive, unless it is too convincing. But, I personally think we should start thinking about this kind of futuristic problems. May be someone can even make a good movie around this theme.
I personally think anger is an adaptive trait, mainly for competition leading upto survival. But, in the species capable of creating a civilization (like humans) this trait has led to crimes and lots of sociological problems, competition over unnecessary issue, etc. So, there is a modern notion that anger isn't good (philosophically and sociologically). But, as the human civilization become more progressive, calm and altruistic in the future, won't it be creating a pitfall for it's own existence should anger, rage and grudge be the only trait needed for survival, when there is a dire need for population control, confrontation with another civilization, etc.