or that, yes, to a certain degree. IMO There are 30-40% which indeed need their licenses taken away immediately. The rest makes mistakes now and then, which is no problem most of the time as long as those drivers hit a tree or a car. When they hit a biker things get worse. And when these bikers again are numpties as well (about 70% are just overestimating their skills by a huge amount) you can guess who gets killed first.
greetz
der butz
PS: those numbers I stated are my own assumptions, they depend on country, area (I live near some beautiful mountain pass that are stormed by bikers from march to october) and other factors.