Why do people ride motorcycles without helmets? Just to look cool?

Not so cool. Not very cool when you are in an ICU after brain surgery and on a ventilator. I've seen many,many people die on MCs from brain injury. There is a reason we call them donorcycles.
Dangerous. Head trauma from motorcycle accidents are horrible. I can't believe people do that too. Perhaps they like the feeling of the air hitting them in the face.
It is commonly. stated in medicine that after mandatory helmet laws came out organ donation decreased.