I'll bet that people who don't wear seatbelts also think they're above average drivers. I believe I'm an above average driver, myself.
Maybe I am but what I also consider is the thousands of completely fucking useless licensed drivers I have to share the road with.
Here's a realistic looking video of a head on collision, played in reverse:
http://www.thinkroadsafety.gov.uk/ca.../backwards.mpg
Here's a slightly amusing video from the 60's showing how to wear a seatbelt, simplified so that even a lady can understand:
http://news.bbc.co.uk/media/avdb/new...85_16x9_bb.asx
(might not work outside GB)