> ISIS conducted public executions, crucifixions, desecration of cultural sites and enslaved people for a labor force. That's textbook asymmetric warfare/terrorism.
The US has done all of these except crucifixions. Arguably, we've done all of them (except crucifixion) within the last decade. I'm not sure we can claim "not crucifying" as moral high ground when Americans did things like the following (warning: what follows is horrifying):
"He was chained by his neck and dragged out of the county court by observers. He was then paraded through the street, all while being stabbed and beaten, before being held down and castrated. He was then lynched in front of Waco's city hall."
"Over 10,000 spectators, including city officials and police, gathered to watch the attack. There was a celebratory atmosphere among whites at the spectacle murder, and many children attended during their lunch hour. Members of the mob cut off his fingers, and hung him over a bonfire after saturating him with coal oil. He was repeatedly lowered and raised over the fire for about two hours. After the fire was extinguished, his charred torso was dragged through the town and parts of his body were sold as souvenirs. A professional photographer took pictures as the event unfolded, providing rare imagery of a lynching in progress. The pictures were printed and sold as postcards in Waco."[1]
This happened in 1916--most would consider the US to have been a nation for over a century by this point.
[1] https://en.wikipedia.org/wiki/Lynching_of_Jesse_Washington