In the case of Jews, they can hardly be called unambitious given the number of writers and scientists they produced.
In the case of Asians, ambitious engineering, scientific and business persons do not seem to be short supply.
Look at the quasi racist stuff this guy wrote. He obviously doesn't like asians for some reason.
"Harvard and the other Ivies don't want to keep out asian people. They want to keep out boring, myopic applicants who spend all day studying to achieve the grades and scores they have and show little sign of interest in contributing to the outside world beyond getting a well-paying job as a lawyer or doctor and raising a family comfortably."
The guy claims to have been an admissions officer at an ivy league school. Doesn't seem likely.
He's out of admissions and lecturing physics at U Kentucky now, which seems a fair result. But anyway, these groups hire bozos to do the low-tier work. The heads of admissions are usually fantastic, but the clerks are lower quality than average because of supply issues.
17% < 19.6%, as if it matters.
If you have an admissions system that tries to select for uniqueness in addition to aptitude, it's going to naturally disfavor cookie-cutter applicants that do not attempt to differentiate or stand out from the crowd.
MIT cares more about scores and STEM and MIT actually has around the lowest family income and lowest percent of rich people in the Ivy League tier.