Especially when the training has nothing to do with military matters and, as in this situation, is completely untrue and impersonates part of the civilian government. This seems like a massive violation of ethics.
Given what happened (Actual loudspeakers deployed) I doubt the official "Tt was as an internal training aid and never actually meant to be put into practice" explantion, that seems to require a set of steps that requires extraordinary levels of stupidity to the point that I don't believe Hanlon's Razor is adequate reasoning.
And if it is just colossal levels of stupidity / lack of oversight / lack of process then I do not believe the military should be trusted with such operations in the first place, training or no training.