The U.S. government didn't order 450 million rounds of wadcutters for Homeland Security to plink at empty beer cans.
They know that dumb as the Yank may be (and he is incredibly, astonishingly, unbelievably dumb) that at some point he is going to figure out what has been done to him and her. Even the beasts of the barnyard know something is wrong when they are moving up that ramp to the slaughterhouse and can hear the sound of the boltgun.
Once they have nothing more to lose and the reality sinks in of what has happened to them, they are going to kick hard.
I pity you fools who think that war isn't always introduced at this point along with a draft. It is the tool of choice for the psychopath and sociopath since the beginning of time. Send'em out of the country to die on foreign soil for some meaningless cause and they can't give you any problems at home. Experience proves the technique works to stay in control and in power.