I am much moved by the logic of government campaigns in faovur of helmets. Basically, it's a "Wear a helmet or you will DIE!" campaign to encourage the safe and healthy activity of cycling.
I remember reading in Cycle, the CTC's magazine, some years ago, an article by Dr. Mayer Hillman/Hilman. He looked at the full autopsy reports of a large number of UK cyclists who had been recorded as dying from head injuries. He found that approx. 92% of them would have died from other, more slowly fatal, injuries.
Of course, there will also be those who, logically, would be saved from fatal head injuries but not sufficiently to avoid being put into a permanently vegetative state?