answer:You don’t have to wear a helmet in a car, do you? I’m not aware of the helmet laws in the US, but in Canada you have to wear a helmet while on any type of motorized bicycle, ATV, etc. I would think that being strapped to a motorcycle might cause more harm than good. At least when you’re in a car, your seatbelt keeps you more or less in the same position, whereas on a motorcycle you might get crushed rather than thrown away and injured less seriously.