The problem is that we fight our wars in 'humane' fashion. Nothing short of genocide will defeat these people. If you aren't prepared to go that route then your war will ultimately be fruitless and so you might as well not bother.
Americans Spaniards and Russians defeated their colonized peoples for a reason, and it wasn't because they played fair or humanely. Its because they afforded their enemies all the rights of demons and smote them man woman and child with extreme prejudice whenever the occasion so called for. The American first peoples never recovered and never will
It is our ethics and our need to envision ourselves as 'civilized' that make total and complete victory over other groups of people impossible. But technologically speaking? There's nothing stopping America from firebombing Yemen city-by-city village-by-village or from poisoning their food and water supplies to make the land itself wholely inhospitable. There is nothing material stopping America from doing unto Yemen as Temujin did unto Khorasan or Rome unto Carthage; from Massacring whole population groups and taking the surviving women and children as slaves, or diluting their demographic makeup with imported people who hate them and will in turn do the butchery for us. We CAN defeat them, the only question is how much of our own civility and humanity are we willing to give up to make it happen.
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Personally I'd rather not and just start shipping shit through the arctic circle instead.