sure the helmet protects your head when you're biking. but what about going up on a ladder? the roller rink? sprinting at 16 mph? getting out of a bathtub. 30,000 people die in cars every year, but no crash helmets for drivers?

People don't wear a helmet for lots of activities. if you need one for riding a dutch bike you should just wear one all the time, like when driving a convertible or walking in winter or descending a long flight of stairs

if you're racing or doing bmx or downhill dirt jumping, sure, wear a helmet, it's not going to prevent a spine injury tho