"Why would any sensible person put their life at risk for $30? Most people have dependents, the law isnt really there to protect the wearer of the helmet (although it does) the law is there to protect the families of people too stubborn to do the sensible thing."
Well that's the problem, for me. Judging by how accident injury rates went UP in some countries (which is completely counter intuitive, but may have to do with how people react to helmets, eg less room by car drivers etc.) the law may in the end NOT protect the stubborn.
As the issue is, as always, odds. The individual that hit a pothole may have been saved injury, but the mandatory laws may mean that for that individual somebody else got clipped by a car "cos the helmet protects them".
I agree bias etc. are a problem in studies, but to me the law should focus to PREVENT accidents. Eg make sure nobody drops that brick
There's quite a few countries where they manage to do just that, Germany, Netherlands, by enforcing driving standards properly and ensuring proper traffic flow.
I did have one fall in my whole adult life on a bike. Wet manhole cover...middle of the road...brand new mega hard kevlar tires...cornering hard. Not doing that again, no falls since. Slowest cornering cyclist on the road