You don't think we hack them? We're far more proficient than they are, the only difference is that Chinese systems are more difficult for your average script kiddie to hack due to the language barrier.
Seems to me like it correlates with economy more than anything else. The best American (and to a lesser extent western european) programmers are making six figure salaries working on world class products and/or getting funding for their own startups. The best Russian and Chinese programmers are doing ... Google Code Jam.
I wouldn't be sure of that. Check out the country distribution of Google's Code Jam participants: http://www.go-hero.net/jam/11/regions