His first two mistakes were 1.) upholstering the weapon and 2.) dividing his attention between his boxes and the weapon. This was someone who knew better. He also did this around his wife. So, I say it was a triple idiotic move. Does that invalidate his good non-idiotic work on the force? No, but he is clearly not immune to idiocy. Perhaps its just semantics thing.

I'm not sure that weapon has a traditional safety, its semi auto.