Consider America's methods of family and social organization. It is centered on the nuclear family and to a lesser extent the extended family. When families marry into other families they tend to have fairly open relations based on whatever levels of affection develop. That is patterned after the "homestead" culture of ancient Germanic tribes where sons enjoyed greater autonomy from their fathers and women had political status comparable to that of men. Male relatives shared authority and responsibility for the well-being of their relatives, even women who married outside the family (note - they were expected to back her up and defend her property rights if she ever divorced, with violent force if necessary).
You can easily see how those impulses still figure in American culture today. They were especially assertive in the gun-toting culture of the Old West.
In southern Europe (Italy in particular), families were likelier to be organized on extended families around a single patriarch who looked out for and organized the different branches of his tree. But only for his sons. Daughters belonged to the family they married into, at least theoretically. Thus Italian/Sicilian men are traditionally less willing to intervene in the family life of their daughters. This is a strategy to keep family organization manageable and practical from an economic perspective.