As far as the scooters requiring a significant benefit to justify the risk, I'm not sure that's even relevant.
Why are motorcycles legal? They're risky from an injury per ride standpoint, they actually kill people, and the benefits are negligible compared to a car which is much much safer.
It's because we (thankfully) demand a pretty high threshold to accept our government banning perfectly reasonable things in the name of our own well being.
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