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The problem with teaching ethics is that most well intentioned attempts at teaching ethics don't do much.
Why should it be good for society if the average student learns military stuff?
Let's put it it this way: a culture that either still has or only recently eliminated conscription would see it as a good thing to be a bit prepared for that.
Don't help much with instinctive decision-making, but there are other things, such as long-term planning.