Answer:
Yes, it's POSSIBLE to ride for miles and miles and years and years w/o ever hitting your head.
The overall impact on society through mandatory helmet use - or NO helmet use - is quite small.
Convincing 1% of smokers to quit would save a lot more lives than a mandatory helmet law.
And no, if the accident mode involves being actually run over by a heavy vehicle, then a helmet might not be of much benefit.
But, the most common bicycle accident is a single accident.
One rider, keeling over for a variety of reasons.
Here, a helmet has a very good chance of reducing your injuries considerably.
Explanation: