Here's an interview of Rick Schmitt from Fairwarning.org whose organization conducted a study on the increase in number of motorcycle deaths, "essentially a doubling of the number of people dying in motorcycle accidents since the mid-1990s. And yet, state laws requiring helmets have been weakened."
Watch Why Rise in Motorcycle Deaths Hasn't Meant Tough Helmet Laws on PBS. See more from PBS NewsHour.
Rick Schmitt says that "hundreds of people every year have their lives saved by virtue of wearing a helmet and hundreds die needlessly because they are not."