Libertarians argue that no normal adult has the right to impose choices on other normal adults except in abnormal circumstances such as when one person finds another unconscious and administers medical assistance or calls an ambulance.
When I came home for the summer after my first year of college I told my mother that my best friend and I were driving to California. She laughed out loud - 2 000 miles in a what? Well my best friend had an old Chevy. What could go wrong?