"Studies by road safety authorities conclude that seat belt legislation has reduced the number of casualties in road accidents." ? http://en.wikipedia.org/wiki/Seat_belt_legislation#Effects
The guys discussing risk compensation agree that this is the case.
So, even with risk compensation it seems seatbelts are a good idea. If risk compensation overrode the benefits of the belts, deaths would go up, no?
Not using Wikipedia as a primary source are we?