Well Billy, there may be some cases where not wearing a seat belt in a serious accident "might" be for the better, but I dare say not in most cases!
My son wrecked his '72 Gran Torino Sport when he was 18 at an estimated speed in excess of 125 MPH.
Over a guard rail, down a 50 ft embankment and upside down on a frozen (thank God) pond.
He broke off the Hurst shifter with his hip which caused him to limp some but other than that, nothing but minor cuts and scratches. He was drinking but, because of the influence of his driver ed teacher, he still had presence of mind enough to fasten his seat belt.
The good thing (he's 50 now) he never ever drank and drove since then!
Just so you know I'm not BSin, check out these pics. Only one wheel was not bent!