Apologies for any snark. What you actually said was, "Helmets are pretty universally known to reduce traumatic brain injuries." This is wrong and not what you

Apologies for any snark. What you actually said was, "Helmets are pretty universally known to reduce traumatic brain injuries." This is wrong and not what you are now saying. You are now saying that among people who have suffered brain injuries, helmets are known to reduce traumatic brain injuries. If the helmets make it more likely that you suffer an injury in the first place, it's not really a consolation that they mitigate the effects. There are actually reasons why many people oppose compulsory helmet laws.