The poor are less likely to issue from stable social circumstances, making them less likely to adopt the mores of society in general, which in turn makes them less likely to participate in its economic rewards. But poverty does not equal crime. Poverty incentivizes crime. Social aggrievement does not equal crime. Aggrievement incentivizes crime. Lack of fathers in the home equals crime, as it correlates most strongly with gang involvement, which correlates most strongly with crime. And a mishmash of liberal and conservative policies lead to a net effect of lack of fathers. Government assistance that requires the removal of fathers from the home is part of the problem. Drug prohibition and poverty incentivize drug crime. The drug war removes men that might still form a useful part of the community and turns them into absent, criminalized, martyred symbols of fatalism. And this infusion of fatalism into underclass culture reinforces the already questionable practices of the underclass, including its contempt and even hostility towards the law, and begins a new cycle. If you want to break the cycle, you have to deal with it all, not just that which appeals to your ideology.