Gruesome fascination is the only explanation. Chinese film making is basically various levels of Hard Boiled mixed with Crouching Tiger Hidden Dragon. Somehow everyone in Chinese media has unlimited ammo and the ability to defy the basic laws of physics. Add a cheesy revenge/drug plot and some pretty actors/actresses, and you have a Chinese film.

@Lucifus: you forgot to list the Indians/Pakistanis, since you obviously left them out when mentioning various Asians.