Like so many heated discussions of late, the divisive helmet issue is raised mostly in the USA.
It never came up in the years I was biking in Europe.
Biking, in and of itself, is not a high risk activity. For the most part, poor infrastructure makes cycling hazardous.
The helmet discussion doubles as a red herring to distract us from focusing attention on building safe infrastructure and requiring car drivers to respect cyclists or face stiffer penalties.
Consider that if we continue to accept the status quo, the money spent on helmets for generations of riders could have paid for better bikeways.
Whether we choose to wear one or not, we could add "let's all work for a future where helmets aren't seen as necessary" to the discussion.