Not all societies believe that individual freedoms cannot be preempted by things that help the society as a whole or protect the individual from dangers. In Ca

Not all societies believe that individual freedoms cannot be preempted by things that help the society as a whole or protect the individual from dangers. In Canada, for example, healthcare is a shared burden across all people. Which alone is a strong argument in favour of safety enhancing policies. There is also good argument for the role of government to help take care of its citizens. The danger of not wearing a helmet is so great that the government steps in to enforce people to do it. It doesn't matter how well the person says they are prepared for the risks or has "done research", the data are clear that they are objectively wrong to not wear one. Sure, people can say they are smart and ready, but time and time again we see that people make choices against their best interests. So, the government steps in.