A lot of studies show that people very rarely change their beliefs - like very few people even in the U.S. changed from Republican to Democratic or back - states changed their colours mostly due to demographic changes - red and blue population had different age breakdown, birth and death rates, and different migration/naturalisation patterns which mostly determine changes in voting outcomes. This is even more true in case of such much much deeper rooted thing like this one. It's obvious: you have a cultural problem, and you can't change people (well you can, but it's called brainwashing and is illegal everywhere but maybe North Korea), so have to replace people.
Mafia isn't about people being literally forced to do something with the fear or death - such an approach totally doesn't scale, even Sicily is not a Nazi death camp. It's about deeply rooted tradition to say, "respect your village elders" and "don't put your family to shame by exposing issues". And people don't even realise they have those beliefs, everyone taken separately just acts "normally", letting the whole society be exploited. Just reducing proportion of people having these beliefs in the first place - to some percentage giving "herd immunity" from them because these informal links need to be able to sufficiently propagate - solve the problem.
Mafia isn't about people being literally forced to do something with the fear or death - such an approach totally doesn't scale, even Sicily is not a Nazi death camp. It's about deeply rooted tradition to say, "respect your village elders" and "don't put your family to shame by exposing issues". And people don't even realise they have those beliefs, everyone taken separately just acts "normally", letting the whole society be exploited. Just reducing proportion of people having these beliefs in the first place - to some percentage giving "herd immunity" from them because these informal links need to be able to sufficiently propagate - solve the problem.