http://www.kqed.org/a/forum/
We know Chua definitely doesn't pull punches, and controversy increases sales. But just as her last book was a "cautionary tale" of the cost-benefit of raising kids a certain way, this new book (wrote with her husband) is not a "this is how you should do it" lesson for success in America. It presents a certain formula that led to seemingly positive outcomes for some groups, as well as the pro-con implications of that approach. It can be misused, doesn't guarantee results, and is not appropriate for all situations.
Also, cultures like Jews and Mormons may feel that they are a "chosen people" destined to be great, yet could be misunderstood and not accepted in mainstream US culture (getting less and less so). That also motivates them to succeed, "prove the haters wrong", and may manifest itself in disproportionate representation at elite colleges and workplaces. I wonder if they showed data that Jews and Mormons who are more devout/culturally aware do better than those who don't, to see if heritage is really the driving force. But of course extremist, fundamentalist Jews and Mormons are not doing as well in the US, as they likely eschew mainstream education and careers. Similarly, I wonder if the authors have looked at LGBT Americans. They may also fit the mold of a proud, fairly successful out-group. However, it may not be their differentiating sexual identity that is driving the success, but rather the fact that they tend to come from more educated/wealthy backgrounds, and live in urban, progressive environments with a lot of social mobility and economic opportunity?
Lastly, cultures/families that promote delayed gratification/strategic thinking/discipline also seem to be correlated with better economic outcomes. This is kind of parenting 101, but if families can get kids to "buy into the program" that short-term pain is worth it for long-term gain, then the kids may embrace the benefits of studying, piano practice, etc. I haven't read this book, so I am not sure if they are claiming that some cultures on average promote these behaviors more than others, or if it's even possible to collect that data.
However, the authors don't really talk about the blue-bloods in America who may not fit their model at all, yet remain quite successful (Bill Gates, Rockefeller types). In that case, wealth-class-environment are a much bigger driver than cultural background and customs. You give someone with any race/ethnicity/background the upbringing that George W. Bush had, and that person is going to be pretty successful. I am not sure if I can say the same if Bush, Paris Hilton, or other "legacy babies" get swapped into a single-mother family in East LA or Flint. So the authors call out the difference between cultural pride and misguided sense of entitlement. The former may motivate a person to strive harder and "live up" to the high expectations of their heritage, while the latter may make a person lazy and arrogant. Personally, I think pride is a dangerous tool that historically has led to more harm than good. Humility and social awareness can also motivate people to do great things for others, while also profiting personally.

