Originally Posted by 2 Piece

First off how did you go from bicycle helmets to seat belts? Where did I ever suggest a seat belt did not prevent anything? A seat belt is a restraint, it prevents (or is suppose to) you from you moving. But it Does Not prevent injury! WTF! Do you really think you put on a seat belt and prevent injury? You put on a seat belt to add a layer of protection and hopefully reduce injury.
A bicycle helmet does not prevent anything. Never has never will, or else the helmet manufacturers would have it written all over their product. Sorry you do not understand that, it is plain and simple. I have said and will continue to say that a helmet can add a layer of protection, but that is totally different than saying a helmet will prevent injury which it will not. Prevention is not something you wear, it is something you do.
If you want to "prevent" head injury on a bicycle, prevent the acts of carelessness that cause the crash. Then you will be preventing something.

Oh, 350htrr, prevention: "1. the act of preventing; effectual hindrance. 2. something that prevents; preventive.