I'm all for reducing government overhead and overreach, but I don't think helmet laws are a good example.
Specifically: Even those that choose not to wear helmets will be safer due to the increase in ridership. The comparison to seat-belts isn't appropriate because my not wearing a seat-belt in a car accident increases risk for others (specifically others in the same car as me).
There is also fairly conflicted evidence that helmets are effective. There is a fairly narrow treatment range where they work well. Be hit by something going faster or slower than that range, and they don't matter much. They are nothing like full-face motorcycle helmets.
There is also evidence (although not well replicated?) that drivers treat helmeted cyclists worse than unhelmeted ones.
I have even seen some people claim that, measured in QALYs other such utilitarian metrics, helmet laws make people unhealthier on average in that they discourage riding bicycles and that the net effect of this is worse than the increased risk, but I don't know how reliable that result is.
I think your idea might work in cities that have designated bike lanes or bike-only roads. For example, in Santa Monica, we have some bike-only lanes, so it might work here, but like in downtown LA, it would be a shitshow and I can basically guarantee that people will die at some point. And then you have to deal with that mess.
In such an non-clear cut case, I would suggest letting people decide for themselves, if they want to wear a helmet or not, would be the best option.
[1] https://helmets.org/stats.htm [2] https://www.washingtonpost.com/national/health-science/do-bi...
> In such an non-clear cut case, I would suggest letting people decide for themselves,
I think it's pretty clear-cut in the case of seat-belts and helmets. Paternalistic laws do work.
[1] http://www.youthforroadsafety.org/news-blog/news-blog-item/t...