Let me give you a South Asian one then. I was a pampered little brat who was waited on hand and foot. The only requirement be that I maintain good grades. This of course came to bite me hard when I had to live alone at the age of 16 in a totally different country and go to school. So I don't think other cultures have some magical secret sauce that turn out well behaved polite little children.

In fact, the only thing to infer from that silly article whose statistical methodology I would be extremely suspicious about, is that some individuals know how to raise their kids properly and some don't. After all, it doesn't take much to produce a child (just a few minutes of whoopee). :-)