I was not aware of the 50% alcohol involvement in motorcycle fatalities, but it doesn't surprise me. About 35% of all vehicle fatalities involve drunk driving, 50% of all pedestrian deaths involve either the driver or pedestrian being drunk, and 20% of cyclist fatalities invovle drunk cyclists (I assume alcohol is a factor for many other cyclist desths too). Then we have 45% of traffic fatalities that don't wear a seatbelt, about 35% of child fatalities did not use restraints, and 80-90% of child restraints are misused. I'm not sure about motorcycle accidents, but 60% of cyclist fatalities did not use a helmet.

The drunk driving and not properly restraining kids are really the biggest issue since it affects others. Things like not wearing a helmet, cycling DUI, and not using a seatbelt are a little more Darwinian in thier punishment.