I don't live there, but I've often heard that the common rationale for not wearing a helmet is that bike-bike or bike-human accidents usually don't result in head injuries. Usually, it is a bike-car accident that can result in head injuries, and if you get hit by a car at speed then you have other issues.
You are correct either way, but the problem wouldn't be as bad if bike lanes are completely separated from cars. I do not have a source, but I'd assume that places like 's-Hertogenbosch, Houten and Utrecht have less head injuries due to the better (completely separated from cars) bike infrastructure compared to Amsterdam or Rotterdam.
I'd personally rather approval or star voting, since ranked choice can create voter apathy through too many candidates (look up the voter response to portland oregons's last election for an example). Having to pick a unique rank for everyone is kind of arbitrary imo, but honestly anything is better than what we have