We (automotive active safety engineers) don't look at it as a percentage-of-inept-drivers, but more like the Trolley Problem[1], that is, overall harm vs benefi

We (automotive active safety engineers) don't look at it as a percentage-of-inept-drivers, but more like the Trolley Problem[1], that is, overall harm vs benefit. To put it another way: seatbelts, airbags, and heart surgery hurt/kill some people, but the benefit outweights that harm. [1] www.wikipedia.org/wiki/Trolley_problem