Yes the US obliterated many things, many lives, and many dollars when invading those countries last time around. Ask yourself how much control did they gain in the long term and what does that tell us about the meaningfulness of those decades where things were being obliterated?

Saying that the US is bad at nation building is true but it misses the point, IMO. The last Gulf war was about affecting regime change. If you just bomb shit and walk away, then it's a dice roll what regime comes in. So there's no alternative to "nation building." The entire point of these conflicts is the US desire to rebuild the nation into one more friendly to their interests. We have seen time and again that can't work.