Does not matter if it is more safe or not. It is typical goverment overreach. Me wearing a helmet is no ones business but my own. It has no effect whatsoever on anyone else in society.
A possible steel man for the opposite position could be that a person hospitalized because of a preventable injury to the head will be of a greater cost to society, and that the sacrifice of personal liberty is outweighed by every dollar going towards something more beneficial.
I'm not saying I totally agree with that, but I think it's an argument that's rarely articulated, whereas the more reductive argument of keeping everyone "safe" is almost always the default.
You're emphatically wrong. If we have an accident and you die as a result of not wearing a helmet then your estate can file a wrongful death lawsuit against me. If there was a helmet law in place and you weren't wearing a helmet at the time of the accident then your estate is going to have a much more difficult time winning a wrongful death lawsuit. Your actions have consequences for others and frankly it's rather childish to try to pretend they don't.
Is your child specifically sensitive to brains? If she sees me lying at the end of a long red smear in a pool of blood with my head intact, but with my leg ripped off and my other limbs contorted into absurd positions, is she likely to have no lasting effects.
This is a logic failure; I didn't say specifically or exclusively brains, I provided an example of one of the many gruesome ways your dead body would cause harm to others based on your poor decision making skills.