Right, so we're talking about the same NZ, so no cycling-related policy as enacted there should be used as a positive example of how to enable cycling (or cutting off reliance on cars as the only mode of transport, but that's another discussion).
People didn't 'get over' it, there are very few cyclists there (rightfully, because you'd have to be insane to drive a bicycle for e.g. the commute through Hamilton I used to have, which is not even a big or busy city, although in terms of distance it would have been perfectly fine). All these things exacerbate each other - the lack of bike lanes, the lack of awareness by car drivers, compulsory helmet wearing, lack of supply of suitable bicycles and supplies, lack of legal protection of cyclists, ...
Bike helmets are not just vanity a problem:
- where do you put your helmet when you arrive?
- ho do you prevent looking unsightly after you arrive? Hair gets smashed, sweat builds up, helmets and straps leave impressions on your face, ...
- additional cost and general cognitive overhead
All in all, bicycle helmets have very few benefits, benefits which are absolutely negated by their negative consequence -
especially having helmets being required by law.