Points system

So everyone knows about the points system when you hit someone or something with your car. What I'd like to know is who thought of this and what determines the point value of a person or an item. Also when is a sufficient number to stop and decide that you have won. Usually people who are handicapped are worth more points, but why? They are already disabled so wouldn't hitting a non-disabled person gain more points considering the possibility of disabling them?

.....more to come