I agree with the choice thing to a point.
The problem with it is, who do they send the bill to for cleaning your brains up off the concrete? Those people who work that sort of stuff have to do work like that. If everyone wore a helmet, would it completely reduce all deaths? No, but if you want to kill yourself, just stick a gun in your mouth and pull the trigger.
Obviously if you chose not to do that, youre pretty much choosing to live, so really, youre a dumbass if you dont wear a helmet.
So while Im all about free choice, the freedom to die like that shouldnt be one you are given. You wanna kill yourself theres lots of different ways to do it.