Maybe relevant: the Netherlands is probably the country with the highest use of bicycles for transport, yet no one, except for cyclists on racing bikes/MTBs or foreign tourists, ever wears a bike helmet. This is because they're only marginally effective at preventing injury, and the disadvantage of reduced cycling use if helmets are mandated results in far worse public health outcomes. See also https://dutchreview.co…
It's nothing like riding a bike in the U. S.