Many times the brass assumes that the Infantryman can see his target and thus should be able to make the judgement call. However, that is often not the case.
Alot of times there is blind fire and supressive fire designed to keep their heads down. You are engaging an area not a person. Secondly, there are a lot of different weapons available. Grenades tossed into a room prior to entry. Mortar, artillery and air strikes called in are area effect weapons.
However, the brass does not take this into account. But I agree with the Cpl on this one, should have called in an airstrike.
It's amazing anyone in those houses could see anything when the plaster dust started to billow around...