Well I think there is a fairly strong semi realism to be constructed in this case: that the Mafia would take over is fairly certain, as government collapses it gins strength from lack of oversight and furthermore has a certain sense of legitimacy through its penetration of culture. Further, there would certainly be a strong urge among the mafia class to enforce a instinction between themselves and the anglo lower class, which would manifest inevitably in an emphasis on the Italian vernacular that exists among wise guysWell it’s not just one or the other. In the west,Scientology and Bhudhism are very wacky and interesting , but that’s what White gave to us. Even then, plausible explanations were given as to why those religions took hold. In most scenarios we’ve stuck more to the realism front. It’s not pure realism, I think that it’s safe to say that some wacky things would pop up so long as they remain semi realistic.