Well, first, you did try to make points about brain injuries caused by wearing helmets. Now you claim you never argued about that, so what is it?Second, it is IMHO not quite intelligent to make an argument about head protection not protectng other body parts. That's like saying a stab protection vest is useless because you can get shot in the head.Third, the first article I linked talks about a systematic comparative analysis of 23 studies examining risk homeostasis hypothesis, of which 18 could not confirm the hypothesis, three showing inconclusive results and only two being arguments for the hypothesis, the analysis concluding there is little to no evidence for bicycle helmets leading to riskier behavior.

I know the studies about mandatory helmet rules (something I actually never talked about), I find people's behavior in this case utterly incomprehensible and stupid, but again, it's not something I argued for. It just shows me we need to encourage helmet use in different ways. Mandatory for children maybe so that they get used to it, normalizing and encouraging wearing helmets by advertisements etc. IDK, but such efforts can be quite successful if funded and supportes sufficiently.