I mean, basically any adventurous activity where you're moving [quickly] with equipment gives rise to use of helmets - kayaking, rock climbing, roller blading, skateboarding, skiing, skydiving, horse riding, ...
Can I ask, is it only safety equipment for cycling you're against?
It looks like you're trying to argue that people shouldn't wear helmets when cycling because people in cars; that have protection from a steel cage with crumple zones, and airbags, and seatbelts, and cushioned seats; don't wear helmets.
Like, sit in your car and get someone to launch a paving slab towards you; then sit on your push bike and do the same thing ... I'd do the first without a helmet, I definitely wouldn't do the second without a helmet (or at all). I can't see how you can find these situations comparable wrt indication of benefit from a protective helmet.
I'm not "against" cycle helmets, but think that their benefits are over-sold. The big issue is when people think that bike helmets are an important safety aspect of cycling, when they're probably not even in the top ten. It's interesting to see different countries' attitudes towards road safety and cycle helmets.
For the record, I always wear a bike helmet here in the UK, but I am not convinced that they really provide much benefit. There's plenty of different studies on bike helmets and a lot of them are very flawed (quite often ones that are sponsored by helmet manufacturers), which is worrying as it should be easy to demonstrate if they are having a big effect on road safety. My opinion is that population wide, they do provide a small benefit, but they can also act as a barrier to cycling for some people, so it's best to not over-emphasise them.
The health benefits from active travel are undeniable, so I'd prefer cycling to be promoted as much as possible and talking about helmets is missing the point.
Can I ask, is it only safety equipment for cycling you're against?
It looks like you're trying to argue that people shouldn't wear helmets when cycling because people in cars; that have protection from a steel cage with crumple zones, and airbags, and seatbelts, and cushioned seats; don't wear helmets.
Like, sit in your car and get someone to launch a paving slab towards you; then sit on your push bike and do the same thing ... I'd do the first without a helmet, I definitely wouldn't do the second without a helmet (or at all). I can't see how you can find these situations comparable wrt indication of benefit from a protective helmet.