We want healthy, liveable cities and to cut emissions to net zero. Getting more people to use bicycles instead of cars will go a long way towards achieving these goals.
In many countries with high numbers of cyclers an adult can jump on a bike and cycle along the footpath without a helmet. In Australia you can be fined over $400!
No you're absolutely right. On an individual level, it always makes sense to wear a helmet. I'll always see someone without a helmet, whatever the context, and think they're a fucking idiot.
Yes, even in the Netherlands.
But individual decisions are not the same as public health policy. And from a public health perspective, mandatory helmets are a net negative.