"If you take enough econ classes, you will eventually learn to describe hypothetical conditions under which destruction could be a net blessing. But, in the real world, it’s pretty crazy for you to think you know that those conditions actually obtain. But if you do think those conditions in fact obtain now, then please explain to me why it would not also be good to have the military bomb a city or two."
Nonsense. I'm not sure there is any good economics argument that would lead someone to expect "a net blessing". Such a claim shouldn't be given this kind of dignity - as far as I know it can't be backed up by any hypothetical conditions worth mentioning. Anyone saying that definitely should be expected to explain why it would not also be good to have the military bomb a city or two.