It is the wrong way to look at this issue. It is not about to "allow" something to a weapon, it is about the question if a human in charge, like a soldier or the like, being entitled to use weapons, is allowed to delegate a) the decision when to pull the trigger, and b) if the person is to be allowed to delegate the responsibility. As with any machine or weapon anyway, be it making "decisions" in an "intelligent" way, or in a "stupid" one like a big bomb just falling somewhere, where beyond hope there is little final influence of a human being what exactly it hits after being thrown of an airplane or the like.