They are being cuffed by their bosses, IMO.
In a previous post, you stated as a given that American forces should be able to beat anyone. I disagreed with you then - but didn't think it worth mentioning.
But this kind of statement - which I've heard many times from that gasbag Michael Reagan while driving home from work [there was nothing else on!

] - is not only an echo of the discreditable right-wing grumbling we've been hearing for decades since Vietnam, I think it's morally irresponsible.
Our "handcuffed" fighting has already killed tens of thousands of civilians - with the attendant rise of murderous anti-American sentiment that will make us significantly less safe for the foreseeable future. When the frustrated commanders decide "F#ck it, we're going to shoot first and (maybe) ask questions later", that dynamic will become 10 times worse.
And you know what? It still won't work. Because a lumbering technology-based army like ours
can not win against a fluid native guerrilla resistance without resorting to open genocide. You might as well try to scoop up water with a sieve. There are plenty of command minds in the military who understand this. But they all resigned in frustration or were fired so they could be replaced with generals who would parrot the insane ambitions of the Supreme Leader.
Which leads me to suspect that the "let's take the gloves off" sentiment really has nothing to do with prevailing. Ultimately, it's the tantrum of a frustrated child who pulls the head off its doll when the voicebox stops working. The insurgency demonstrates every day that we are not as powerful as our national myth insists. So let's just lash out blindly at every brown face we see. That will teach them!
As Orwell told us: The point of torture is torture.
The point of indiscriminate killing is indiscriminate killing.