Credible? Video evidence of these cases is everywhere - and for the very reasons stated. It's often cheaper to kill than to injure.

This is also why if you are injured - nobody will help you in China. If they save your life, they're responsible for your well being/medical bills. So people will let you die on the street.

This is what my Chinese friends were telling me over the years, it's true, but shows a broken legal system.