nope...
with that same line of thinking, i suppose a man jumping off mount saint helen shouldn't hurt nearly as much as falling off a bed, seeing as though one happens more than the other, and the fact that i can recall someone getting hurt from the fall from the bed, and not the mountain.
Listen, head butts happen, whether on accident, or on purpose.... And a lot of times it happens so quick ref's don't even notice until a cut is present.... but just because 1 happens more than the other doesn't omit the fact that Punches behind the head are a lot more dangerous than head butts....
once again, i ask this

ok, which would you rather take, a headbutt from holyfield or a punch to the back of the head from peter?
If you have recieved both, im sure youll pick the headbutt
k,