Freedom is largely where you decide to draw that line between social responsibility and individual autonomy.
For instance, you want to increase bike safety? Outlaw bicycling. It's a menace to drivers. I don't bike, so why should I care about that particular freedom?
Pedestrians get hit by cars. We can't outlaw cars, so let's make pedestrians wear flourescent jackets and helmets.
Get rid of the motorcycles. Oh, and noncommercial boats. All of those are dangerous, and if some uninsured person gets injured in them, it comes from my taxes. Oh, and without noncommercial boat traffic, we could cut Coast Guard/Lake Patrol staff and save even more money!
Mountain climbing? You could fall. Orienteering? You could get lost, and my taxes pay for park rangers. Swimming? Lots of people drown every year. Let's make it illegal to go within a mile of a river without wearing a life vest. Even though airplanes are safer than cars, we'll go ahead and ban them because they make some people nervous, oh, and terrorists.
My freedom to bike without a helmet is one I don't exercise, but it's one I defend, along with the stolen rights for me to not wear a seat belt (which I do not) or a motorcycle helmet. I'm perfectly happy with (very slightly) higher taxes to pay for that freedom. I feel that it's my social responsibility as an American to support the freedoms of my fellow citizens, even if they get their kicks bungee jumping naked. As long as those freedoms do not impinge on the rights of others*, then they're no business of yours or the government's.
* Your examples of drunk driving or second hand smoke are quite different animals from personal safety laws. I do not endanger your safety when I don't wear a seat belt.