I mean I feel like the USA has been continuously bombing somebody since at least the first Iraq War, and I'd lay even odds on "since the 30s" it's just that I've only had long term memory since the Bush 1.
I think it's less concern about the domestic effects of war and more about the general inefficiency of murdering-the-shit-out-of-countries when it comes to foreign policy.
Its just business. The military-industrial complex is able to get billions in tax money in order to bomb people. So, thats what they do. The funding makes the complex powerful, and gives it the ability to lobby for more money, so they bomb more, and so on.
I think it's less concern about the domestic effects of war and more about the general inefficiency of murdering-the-shit-out-of-countries when it comes to foreign policy.