Here in Indiana, we have "helmet laws" but they don't apply to responsible adults. Young riders and those with learner's permits are not only required to wear helmets, they're not supposed to be on the roads after dark; once you've got an actual motorcycle endorsement, it's your decision. --In practice, the opposite obtains and other than a handful of hardcore old school riders, the helmetless are far more likely to be youthful and/or on learner's permits. One presumes they either learn the hard way or remove themselves before passing the riding test. Hello, Mr. Darwin.
Me, I'm lookin' for 10" studded snow tires for my Chetak -- but perhaps I should save up for a rustproofing job first.