While I do think numbers/statistics can be skewed to prove a point either way, I think riding w/out a helmet is completely moronic.
sourceIn 2003, fifty two percent of fatally injured motorcycle riders were unhelmeted.
Two-thirds of unhelmeted fatalities were in states without a universal helmet law.
NHTSA research shows that, in potentially fatal crashes, helmets have an overall effectiveness of 37 percent in preventing fatalities.
In 2002, helmets saved an estimated 1,005 lives.
At 100 percent use, an additional 579 lives could have been saved in 2002 alone.
Only 58 percent of motorcyclists were observed to be wearing helmets according to the 2002 National Occupant Protection Use Survey (NOPUS).