I would be willing to bet that the coach put that boy to play that position for that reason. What better way to help keep your win record as a coach than to put your big ogar under the basket. This is something often seen in small town sports.
What kid of his size and age wouldn't smile being instructed to knock them smaller kids around like that? Does it make it right heck no !!
Why does the school allow the coach to run a team that way, of corse one realy couldn't prove he was telling the boy to be so rough, but they could still have that boy removed or benched
Why don't the parents say anything ? Are they realy more concered for a win than a kid with a broken bone or other injury ?