EDIT: This was obvious in response to Dayton3, and not you Joe. You just posted quicker than I did.
Because your "reasons" go completely against the whole point of the Star Trek franchise. The whole point of the franchise was that it was about a better future in which bigotry, and hate no longer existed (at least originally), and also about diverse group of well developed characters going out and exploring the universe and making new friends (hopefully). It was not, and was never intended to be a purely action based series.