Wasn't too long ago people in the US were saying those kinds of things about Italians.
It's been allowed to fester because the late 20th century was (so far) the high water mark for societal tolerance of that sort of thing and it hasn't been abused enough since to really see much legal scrutiny.
High-trust Anglo civilization is not compatible with the attitude towards civil authority common in the 19th-century Mezzogiorno. It took literal generations to fix.
Waspy paternalism gave us eugenics, multi-generational welfare and plenty of other great stuff so it's not like the alternative is all that much better.