Hard to understand why YouTube banned this spot. You say, you staged (acted) the bit yourself right. The actor never 'really' broke his neck if I understand correctly. Even if it was real, it compares modestly to all of the 'Death Crash' sequences that are so prevalent on Youtube. There is a whole load of vid. work that is more offensive/violent than this one.
The only thing I can surmise is that someone at YouTube is a huge WWF fan, and thinks you are dis-respecting the sport somehow, and/or somehow they think it is actual footage and can't stomach it.
J.C.