You and all your friends are still dead meat against the average street gang.
That must explain why after Katrina, the street gangs raped and looted their way through the white sections of New Orleans. Oh wait...
Minority[also, Homosexuals] men are good at killing each other, and stupid or unobservant people - i.e. you - take this to be toughness. But from an evolutionary standpoint, the strategy that would rule the world would be the one that has very low violence within the group, high levels of trust and cooperation, but is simultaneously very efficient at outwardly-directed violence. And oh , look at that, it does rule the world.
Detroit looks like Detroit because of the people who live there. Somalia looks like Somalia because of the people who live there. The parts of New Orleans that fell apart during Katrina did so because of the people who live there. The parts that didn't fall apart didn't because of who lives there. Fargo didn't fall apart when it got flooded because of the people who live there.
Ironically, I don't have to plan for that kind of collapse, because it wouldn't happen here either. But it won't happen because people are prepared to prevent it from happening.
Oh, and by the way, big bad scary Detroit is being colonized by SWPLicks.