It's a combination of many of the things said here. As for enclaves, even if there were all Italian neighborhoods, it's a different time. Back when the Mafia formed they had almost no opportunities, and they were usually jobs paying a measly wage. Education helped too. The Mafia also changed, most are into honest businesses, or gambling. The ones who are still acting as if it's the 1940's are usually quickly arrested and jailed, or are rats (Gene Borello, associate John Alite) or weaklings who did not belong in that life (Michael DiLeonardo, John Pennnisi) The later wind up on youtube or trying to do book deals.