Do you have some data for this assertion? The US actually has a pretty low fatality rate per mile driven. Although, anything above zero isn't acceptable to some people...
> It's insane that we let kids drive cars before they've even learnt how to use road.
We don't, at least in the US. You have to go through "Driver's Training" first in order to get a Learner's Permit. This training teaches all the road laws, best practices, scenario training, and how things work. Then you get your permit and are allowed to practice only with a licensed driver in the passenger seat.