It was the same story in Vietnam. The US spent billions and could never win either!
most of you never watched (enough) 漫画, this one is perfect to teach you the basic concept of war :
https://upload.wikimedia.org/wikipedia/en/9/9d/DragonquestTheAdventureOfDai_vol1_Cover.jpgUnderstand why your foes are angry and ready to use violence, evaluate with an open and honest mind the complaints (generally you will see that there is a problem, for ex gmo, systemic prostitution, immunity for sexual offenders and ctrl+p for my case (in short ofc)), solve the issue$, become the best friend of your old foe that will do the Do with you.
Of course it's beyond the grasp of the "man behind the curtail" because he is a sociopath thinking only about him, him, and him. always. Which means that once the combat is engaged there is no others choice than to break him, just before death, so that he can still have a chance, and if his "soul" is gone, finishing IT as a sign of mercy.