Livre d'Or

Well, quite. Something like one in three thousand UK cyclists can expect to die in the saddle - and of course not all of those will be of head injuries, of head injuries that even the most optimistic helmet proponents think are preventable, and of such head injuries not accompanied by other mortal injuries.

Given that, at a conservative estimate, one in ten helmet wearers will tell you a "saved my life" anecdote, we conclude:

1) helmets make you grossly accident-prone (in which case, don't wear one, and why don't helmet wearers keep breaking bones etc).
2) only the grossly accident-prone wear helmets (but clearly usage rates too high for that to be true).
or 3) nearly all these anecdotes are wrong.