What did the Army Corps of Engineers insist upon back when all plugs were two pronged? Covering the outlet with a deflated football? At least prominent warning signs? Prayer?
I've heard that rationalization before. Consider:
- What are the chances a plug is only partially inserted? Further, it's inserted enough to make contact with the live terminals inside the fixture but a small amount of the prongs are visible.
- What are the odds that something is dropped where it will hit this mal-inserted plug.
- Now what are the chances that this dropped something is a) Conductive, and b) Thin enough to fit in the gap
- Assuming all of the above probabilities come to pass, so what? The intruding bit of metal will spark and sputter and it will either explode out of the socket or the breaker will flip.
I suggest, based on the odds, that anything deleterious happening because the ground plug is beneath the hot/neutral has never happened in the history of the world.