emtp wroteWhy penilize someone for something that we (official's) should have taken care of when you had an oppertunity to fix it.
Well, probably because it's the head coach's responsibility to have the correct number of players on the floor, not the officials. Yes, we try to fix the coach's screw-ups if we can, but if we can't, oh well. It's the coach's fault ultimately, not ours, and if play starts with 6 on the floor, we gotta call it.
In the case above, the throw-in never ended- so we have a little justification for getting the extra player off the floor. If the clock had have started though, no way can we fix it then.