Now, how if one were to sustain a fatal injury at a low speed from some sort of freak situation, what kind of injury do you think it would be? The answer would pretty much have to be a head injury. It seems to me that a helmet is cheap and easy protection. It obviously can not eliminate head injuries but it is much better then nothing.

As to people riding around without helmets, well bicycling isn't that terribly hazardous. You can ride a bunch of miles without crashing. But events aren't always under your control as you well know.

Also, I have seen people land on their heads at high speed and get up without a head injury thanks to helmets. I have also seen them sustain head injury. I have never ever heard anyone who crashed and hit their head who was not glad that they were wearing a helmet at the time.

I suppose it all depends on do you feel lucky?