It's really interesting to see how emotive this subject is.
It seems to me, having read the whole thread, that several themes are recurring:
- Someone known to a poster had an accident whilst wearing a helmet, and the helmet is then said to have saved the accident from being much worse. But how could we know exactly what might have happened had the person not been wearing a helmet?
- A HCP or police person has said that they have seen head injuries which would have been worse if a helmet had not been worn. See above.
- A HCP or police person has seen serious head injuries in a person wearing a helmet, and has said that they would have been less serious had the person been wearing a helmet. See above.
- A poster testifies about an accident they have witnessed in which the helmet was damaged and speculates about the same kind of damage having happened to a head. Helmets are designed to shatter on impact, so that they absorb the shock of the impact rather than transferring it to the head. A head would not necessarily be damaged in the same way by that impact -- though it would be damaged in some way. Again, exactly what this is cannot be known exactly.
- Head injury is so serious that we must take precautions against it. True: head injury is serious, and the risk of head injury is one of a number of risks we have to weigh up.
- People who do not make their children wear helmets for cycling and/or scooting are irresponsible parents.
No helmet will protect someone from serious injury if they are in collision with a car. They are designed to protect from low-speed impacts. They are pretty good at this, but not so good at protecting cyclists who are in traffic accidents. Racing cyclists have to wear helmets to comply with the public liability insurance of race organisers, not because all racing cyclists think they are safer while wearing them.
Both my children have had accidents while scooting at speed and not wearing helmets. They have bad grazes and bumps to the head: perhaps a helmet would have avoided this and maybe it wouldn't), but these don't seem to me to be so serious that they require protective clothing. The most serious head injuries we have had as a family have come from falling downstairs -- in one child's case, over a safety gate, ironically enough. That caused quite a serious concussion!
Life is full of risks, and we are very bad at weighing risks against each other. We think some things that are relatively safe are very dangerous, and some things that are much more dangerous we take in our stride. We tend to overestimate the safety of things that we 'have' to do, and to overestimate the risk of other things that seem dangerous but are relatively safe. One of the reasons, I suggest, that cycle helmets are an emotive issue is that we overestimate the risk of serious brain injury, and because we feel we can control the risk by making children wear cyclle helmets.
We don't have robust research to tell us whether they do in fact protect in the way we want them to. In the meantime, we have to weigh up the risks we are prepared to have our children take, and to what extent we feel compelled to intervene.
For on-road cycling, my children wear helmets, otherwise they don't. I think that's illogical, but it's how I weigh the risks.