That is an excellent summary of the problem. The problem is the middle class boredom and the longing to escape it to a more "rugged" life style - the ghetto, the boheme, the country-side, the wilderness. So the main difference between the so-called "leftists" you are talking about and other segments of the middle class is the cultural icon that symbolize that escape: gangs, hip-hop, punk, bohemian lifestyle versus SUVs, safari, survivalism etc. But both fit well within th ecapitalism system - since both rely primarily on the consumption of cultural commodity.
wojtek