Logic behind "no dunking in warmups"

[BktBallRef]

You would have kids trying to dunk who can't dunk. Those kids would be the ones who would injure themselves or damage equipment.

Further, how would you like to cancel a game because the rim or backboard was damaged during warm-ups? Schools don't have enough money to buy books or pay teachers. They certainly don't have extra money lying around to pay for broken backboards and bent rims.

It short, no good whatsoever would come from allowing kids to dunk during warm-ups.