I support his cause. Unlike DWI laws, the only person that you are endangering by not wearing a helmet while riding a motorcycle is yourself.
That said, if you ride a donorcycle (wow, my Mac OS 10.6.6 spellchecker didn't flag "donorcycle" as a misspelled word) without a helmet, you deserve, in the words of test John Gabriel, whatever comes next [http://www.penny-arcade.com/comic/2002/12/9/].
I'd be MORE supportive of not having mandatory helmet laws if, in the event that you managed to crash your motorcycle without a helmet, the ambulance crew arriving on the scene was allowed to point at you and laugh, and then proceed to steal your wallet, steal your shoes, and roll you into the nearest gutter, even if you were still alive at that point in time...
(it's statements like this that remind me that I once reacted to a statement by George W. Bush by exclaiming to a (very liberal) coworker "Compassionate conservative? COMPASSIONATE CONSERVATIVE?! WHAT THE @#$%?! IF I WANTED TO BE COMPASSIONATE, I WOULDN'T BE A @#$%ING CONSERVATIVE, NOW WOULD I?!".)
(Incidentally, I know an oddly large number of current and former EMTs and Paramedics, and every single last one of them agrees that the above proposal (the part about kicking idiots into the gutter; many of them are quite liberal otherwise) should be made into law. Keep this in mind the next time that you have to call an ambulance because you got injured while doing something really, really stupid.)