We are told to always assume any gun to be loaded, and to handle and treat them as such.
But unexploded munitions are to be treated as harmless if they didn’t go off when they were originally deployed.
OK, got it.
My wife’s uncle found an unexploded mortar round in a field in the Philippines in 1945 (I think). He and his buddy started playing football with it. Tossing it around.
My uncle fumbled it. He spent the next two years in various Navy hospitals and came home short a leg.
Young people do all sorts of stupid things. (He was a sailor, he didn’t know from nothing about mortar rounds.)