Do a Google image search on cycle helmets. They all have angular edges that can catch on flat ground as you slide along, let alone objects you meet. Motorcycle helmets aren't so stupidly designed, so why are cycle helmets made that way?
I've seen statistical evidence that seatbelts work.
I believe there is no statistical evidence that cycle helmets cause an overall reduction of injuries.
I'd like to be proven wrong.
EDIT> It's worse than I thought...
Attachment 22184
What evidence is there that cycle helmets reduce serious injury?