I don't think helmet laws are as cut and dried as simple freedom of choice.
I personally would like to be "free" from potentially having my tax dollars pay for the emergency, rehab, and ongoing care for an individual who chooses to ride without protective gear...
No, protective gear will not prevent all injuries. But the evidence gathered over decades makes it pretty clear you should have it on every time you ride -- especially if your idea of freedom, like mine, includes not
voluntarily putting myself in a position where I might have to hang off this country's social safety net.
On the other hand, if you're insured to the hilt -- well then I'll look forward to seeing your smiling, helmet-free face out on the road!