You can't just compare Fallujah and Grozny. Of course urban warfare is destructive to the city no matter what, but the US and Russian tactics are very different, and so is the destruction. Dropping tons of low precision thermobaric weapons on a city is a Russian thing, unmatched in its destruction. (The is no American equivalent to the TOS-1[1] for instance).

That being said, that doesn't mean I approve US invasion of Irak in any way (because I do not), it just feels you're comparing Pearl Harbor with Stalingrad… (Ok, not literally, because there is a two orders of magnitude difference between Pearl Harbor and Stalingrad, but you get the idea).

[1]: https://en.wikipedia.org/wiki/TOS-1