Are you purposely ignoring the second part of the statement I made?

Do you think that everyone who has ever said "A helmet saved my life!" has had their lives saved by wearing a helmet?

My helmet story involves going over the bars and landing on my head, in the street. I ended up with what I think was probably a very mild concussion. When I examined the helmet, I saw that the foam liner had compressed as intended, also that the liner and shell had cracked in the impact area.

I believe that the helmet helped mitigate injury, certainly scalp abrasion and possible contusion, potentially a more serious concussion or skull fracture.

Did it save my life? Probably not. But maybe. Did it mitigate injury? Probably. But maybe not.