I'm not usually one to fall on the side of loose legislation that allows people to engage in reckless, irresponsible, and selfish behavior. Take smoking for example...I think it should be banned in most public places. /end thread jack. In this case it is simply on the rider to engage in good safety practices. As a rider myself the joke has long been that a helmet only makes your face look better as you stare up out of the casket. It's selfish of you to ride that way but it's still entirely your choice to do so. For the record I don't ride sans helmet (and I'm a non-smoker).
If any more soft headed pittsburgh squeallers want to ride without a helmet... GOOD ON YA! Yeah I'm still bitter about the intentional hit on Carson Palmer but that's a story for yet another thead on yet another board!
Ride with a GOOD helmet. It just makes good sense.