China has an effective government but this has it's drawbacks.. While people point out the low crime rate they often forget the draconian punishments for acts which are rights in other nations like freedom of speech and protests. The same could be said of KSA, low crime rate but few think it is a beacon of human rights with laws against atheists or even blogging about Islam. Each nations has factors which need to be evaluated beyond basic crime rate results.
China government might lie about the rate of crimes there...however, I read long time ago from independent website about the crimes rate in china
plus I have a lots of chinese friends who said about that
when I came to malaysia first as tourist, I was thinking it pretty safe country, however, after I came as student, I know the complete opposite is true