Is this your theory? You haven’t seen Asian Americans participate in scouting, clubs, sports? Are you living in an area devoid of Asian Americans? Or do you have scientific proofs that “cram schools” exclude other activities in the US? And don’t cite newspapers article that point out extreme cases to support their agenda.
As pointed out, other students of other ethnicities also go for tutoring after school or religious studies. No doubt attending Kumon for an hour or two may take away some time, but there are many hours in the day that are free for other endeavors. Some only attend a couple of years and on weekends. I see kids hanging out in the mall, in the streets, coffee shops after school for hours. They are also eating up free time. It is far too easy to point out a group of Asian Americans because of their high visibility.
At least they are not joining gangs, having teenage pregnancies and breaking the law. That, in itself, they are contributing to civic virtues.
If you read newspapers in the Bay Area, there are many articles of Asian Americans making Eagle Scouts. They have been Olympian gymnasts, ping-ping players, famous fashion designers,artists,authors, movie directors etc etc. My son’s baseball team won a CCS championship in baseball (those who live in the Bay Area know of its difficulty, 120 high schools competing) and there were 4 Asian Americans in the starting lineup.
There are many posters here whose kids have married Asian Americans or have Asian Americans significant others. I doubt any of them fit your stereotypes. Look at Priscilla Chan, daughter of working class immigrant parents, raised by grandmother and did extremely well academically. Does she lack civic virtues? Does she look depressed?