And a helmet doesn't prevent broken bones, spines, so they will still drain hospital resources.
When people are deterred, they take less eco friendly forms of transport, and are less active. This has negative health consequences, although difficult to measure and compare. But it’s not black and white.
The entirety of Europe gets by perfectly fine with public healthcare and no helmets. So I don’t buy the argument that this is truly a problem for healthcare.
Yes and no. The Netherlands is seeing some second-order effects of this:
https://www.cbs.nl/en-gb/news/2023/16/more-traffic-deaths-in...
You need to look at the bigger picture - first of all what’s the probability of having an accident, then within that probability what’s the difference between wearing a helmet or not. That then needs to be compared against the risks of staying sedentary. It’s complicated.
Traumatic brain injury is a common outcome of an automobile collisions - yet we don't see people with the same concern for introducing mandatory helmets in day-to-day driving.