Ah, in that case, I apologise and we're in agreement. I construed it as saying the opposite, that the US wins wars without many casualties (relatively speaking) because it's superior rather than because it learned in Vietnam that it can't win conventional wars and so now only targets places that can't really fight back.

I'm afraid that you may have walked into an in ongoing discussion as to whether the US military and NATO are forces for good or are particularly good at what they claim to do. People who dislike NATO and US imperialism can get a bit critical. You can't win though, because now the USians who 'have no [real] concept of all-out war' will be around to get you from the other side. 😬