The Mafia banned kidnapping in Sicily for pragmatic self-interest, not morality. [fact]
Tommaso Buscetta and Antonino Calderone both maintain that there was a rule in the Cosa Nostra forbidding kidnaping, and with a few exceptions the mafiosi tried to enforce it. "The commissione," says Buscetta, "decided that kidnaping should no longer be committed in Sicily, not for humanitarian reasons but because of a straightforward utilitarian calculation. Kidnaping creates a general sense of hostility among the population, and this is counterproductive if it happens in those areas, such as Sicily, where the mafia is traditionally entrenched; besides, kidnaping attracts a lot of attention... from the police"
XREF: Connects to broader literature on how criminal organizations regulate themselves to avoid law enforcement attention and public backlash.
Diego Gambetta, The Sicilian Mafia The Busi…, loc. 453