I will never ride a bicycle or motorcycle or scooter in any location without a helmet.

Those that do so are simply stupid. It's 2025. Helmets are such a ridiculously high cost/benefit ratio.

It's like not using a seatbelt, or smoking cigarettes. Totally insane, knowing what we now know.

Doesn't matter if it "isn't done here". TBIs work the same in Bangkok as Boston.