you are an idiot. first of all, mass times speed is momentum, not force. second, you dont need a helmet if you dont crash. if someone else causes you to crash they should be held responsible.
third. i ride. i wear a helmet. i have been in an emergency room after a crash. it always seemed strange to me that hospital staff has more respect for failed suicides and drug overdoses than someone riding a bike. keep up the good work there, medicos, this is why i dont have an organ donor card. i'm sure after you cut off my $800 leather jacket for a leg injury you would hesitate to go after my organs, eyes, or WALLET.