It is unfortunate that this type of incident happens, but it is unlikely to change anytime soon. Due to the government attempting to reduce strain on the judicial system these laws are setup to be as situation independent as possible. This in turn means the laws are oversimplified, so that each law covers as broad a section of accidents as possible. If a car and a bike collide it is the majority of the responsibility is by law applied to the driver of the car. The previously mentioned 70% is the minimum for driver responsibility. This has been taken to the extreme where the families of suicide jumpers have received compensation from the drivers who unavoidably killed them.
On another note it is just as much a crime that you are an English teacher. Your grasp of the English language is as appalling as the application of the law in China.