Earlier quoted context omitted.
Typical bicyle helmets don't help much with a face-first landing on the tarmac, your chin takes most of the pounding. I can confidently say that from repeated ... 'experiments'. In contrast, a motorcyle helmet that also wraps around the chin would be of great use in most bicycle accidents. 185 cyclists died A more interesting statistic would be: how many of those deaths would have been prevented by a bicycle helmet?
That depends entirely on how you fall off your bike, which depends on your speed and numerous other factors. The problem here is that it's pretty hard to tell after the fact whether a death would have been prevented by a helmet. We can guess, speculate but it's hard to measure the exact forces exerted - and also how someone's biological material will react to that (the brain). In all my reading around this issue, tho…
Do you wear one while walking? Or hiking? There's also an increased risk of brain injury from these activities.
Most people I know don't wear one, because the combination of the discomfort, hassle, inconvenience and appearance aren't worth the perceived low increased risk of cycling compared to, for example, walking.