The quotes on his website are hilarious.
"He supports my right to not wear a helmet on my motorcycle."
Does he support the right of the first responders to not have to scrape his brain off the road or the people at the hospital that could use their time better than trying to sew his face and jaw back on? What about the people at the assisted living place that have to wipe his vegetative ass and the people paying more for healthcare if he doesn't have insurance? What about the therapy for the little kid that just saw a guy's head explode all over the intersection? If you don't wear a helmet you're not just endangering your life but you're fucking up other people's lives and that's where liberty stops. Having liberty doesn't mean you get to do whatever you want to and fuck everyone else.
As far as burden to society is concerned, do you really think that a person without helmet will cost more than one with helmet? I guess it is the contrary but maybe you can quote some research on that topic.
I'm more a biker than a motor-biker and
see how many cities now step back from forcing people to wear a helmet exactly because the impact to society is negative. Car drivers overtake helmet-users with less distance than others and beyond a certain speed, injuries of helmet-users are just as severe as without helmet.
Far harder to measure is the impact on how much sport people do when you tell them by a law that riding a bike is dangerous.