The gung-ho warmongers (almost all of them Republicans) who are happy to destroy lots of civilians, as long as they are far away, ignore the facts of that Allied air campaign. First of all, the strategy of mass bombing of civilian areas, mostly associated with the head of English Bomber Command, Arthur "Bomber" Harris, was never universally accepted. Even at the time, large numbers of officials thought the process was counterproductive, and as it went on, there was little evidence that it accomplished its goals. Today, I think I may say, it is regarded as having been a failure. Second, let us remember this: by the time that Allied carpet bombing became widespread, tens of millions of people had already died in the war; the stakes were vastly higher than they are in the Middle East today, and they made it possible to justify actions for which there is no excuse today.
Well, I don't want to belabor the issue. After all, people that can find it in their evil hearts to justify torture, imprisonment without trial and criminal aggression against foreign countries, can hardly be expected to feel bad about a little "collateral damage." Still, it is probably a bad idea to dignify this sort of behavior by pretending that it is the conduct of decent human beings.