That is how we ended up with compulsory bicycle helmets in Australia when the rest of the world mostly manages without such rules.
At least in Oz, we have a vessel in which we can deliver the mangled brains to their mother.
This especially applies to the morons who ride with their helmet other than on their head, correctly fastened.
I have witnessed three bicycle accidents caused by uneven or protruding road surfaces which, judging by the damage to the helmets, would have resulted in serious brain injury.
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