Here's one reason....they're good breeders
Ever seen how many kids each couple have? Roman Catholics most of them too. Big families, tight families...cousins, aunt, uncles, grandmothers, grandfathers, etc... I see Lee's point, and I agree with him, having lived in the south.
The past 2 or 3 decades have increased the population exponetially. The ones I knew about down south...most in their late teens and 20's to 30's were in gangs and ran the meth trade.😈