If you'd review the rules at https://news.ycombinator.com/newsguidelines.html and post only civilly and substantively from now on, we'd appreciate it.
There's a great line at the end of Tora! Tora! Tora! from Admiral Yamamoto that would undoubtedly apply in such a scenario, "I fear all we have done is to awaken a sleeping giant and fill him with a terrible resolve."
The war against ISIS in Syria is a good example: Americans struggled for years, and then Russians came and pretty much ended the whole thing in 3 months. How? By bombarding civilians, including the hospitals, and (allegedly) using chemical weapons.
So, US have no problem winning the fight against guerillas, other than its own restraint.
I still don't believe that brutality and disregard of civilians is the only way to efficiently win an armed conflict against insurgent groups, though.
— Hey, you! Don't kill civilians! — Okey.
— Hey, you! Don't kill civilians! — Идите на х! — Okey
It'd be just about the dumbest thing a cartel ever did, to engage the US Government in such a moronic 'war.' They'd quickly abandon that idea. It's the reason they don't target prominent people in the US Government as it is now: the US can kill their leadership top to bottom, with just a bit of effort and resources pointed that direction. They know that, so they stay within certain bounds of behavior accordingly.