I am very caught between knowing that helmets can save lives on one hand, and the personal liberties issue on the other. Not every personal decision needs to be legislated. Now, for KIDS riding 4-wheelers, that is another issue. If their parents are idiots, they shouldn't have to suffer. So I believe in mandatory laws then.
It's kinda the Darwin Theory to me - if you're dumb enough not to wear a helmet on a motorcycle, then perhaps you're dumb enough to be taken out of our little gene pool.
Just a thought.