Which is exactly why the US isn’t going to carpet bomb their own territory. One, ruling over a rubble-laden wasteland isn’t very appealing. Destroying your own infrastructure isn’t good for GDP. Two, soldiers are going to have a lot harder time bombing their own homeland, regardless of how well trained they are.
That’s like saying the US wouldn’t fight the confederacy because it would damage their land…
Reconstruction was mostly social, not infrastructure. It was reconstructing social order in place of what was removed (plantation farming a slave labor), not buildings/roads/railways really.
And things have changed quite a bit since the civil war. We have a very interconnected country and world. Airplanes exist now. Nuclear submarines and cruise missiles. The destructive power of our weapons has increased ten fold. And we have instant access to 24/7 new media. I don’t think we have the appetite for such a thing in this day and age. Not to mention how any number of hostile nations would be foaming at the mouth looking forward to us having our guard down.
So then the citizenry and army would be fighting on equal footing then and the “we have all the guns here in Texas” argument goes back to making sense. Either the US uses their overwhelming military power or not, you can’t choose both.