The people who are affected are the disaffected and policed underclass. The black or mexican 'gang banger' is the leading edge of a community that has so little investment in the state's 'defense', the political class and the economic system that they're resorting to outright black markets in broad daylight, and flaunting their paramilitary status (mostly fantasies) in their popular music. Unfortunately, most of these guys are carrying a handgun at the most. A few own larger weapons, but they're harder to conceal or carry in a car. In a more permissive legal system these 'thugs' and territorial mafias would be able to openly carry large and small arms without need to provide permit or reason. This, obviously, is not acceptable to the Congressional-Police-Prison Union Complex. One can not have organized, funded resistance on the home front!
Something similar is true of the punk crowd. Rowdy, drunken, drugged, detached from the incentives of propaganda warfare, they can cluster together. Their disregard for the law and the politeness of civil society is well known, and often genuine. Yet punks, whether they're brawling with each other or the man, are usually armed with a baseball bat - if anything. I am almost certain that at least some of these guys would have uzis, if it wasn't for the criminalization of firearms and their carry in urban areas. Again, it's not the sheltered middle class that these laws are targeting, it's the people who are able and willing to subvert the elites and their lemmings in the middle class.
Lumpenproles have the most to lose from gun control. The urban garrison state is just the beginning.