Yours are anecdotal evidence of an extremely low risk. There are some bike accidents, which are already rare; Very few involve the head; and even fewer would be

Yours are anecdotal evidence of an extremely low risk. There are some bike accidents, which are already rare; Very few involve the head; and even fewer would be saved by a helmet. Whereas, requiring a helmet is a sufficient disincentive to biking that studies have shown that it increases the number of deaths in countries that made it mandatory, by making people drive instead and later die from cardiac diseases and obesity. So yes you should wear a helmet while biking, but we should not make it mandatory. In other counter-intuitive statistics about biking, passing at the red light is good for you.