They already do, mass propaganda and creature comforts... but in the end, if it's something truly bad going on, there's nothing they can do to stop it. They'd fall. Hell, it might happen in a few decades. Considering how corrupt and bought our politicians are from the corporations and rich elite... it's f***ing over our country and causing anger and tension> Right now Fox News is doing a good job of passing the blame onto "the liberals" and "democrats" but it's bullsht and the majority of the country knows it. Sure Fox News has a lot of viewers, but they are old f***tards. The moronic Baby Boomers who think they are entitled to everything, but no one else is. Their generation will be dying off soon, and then the Republicans and Fox News are f***ed. And a lot of our military is pretty mad at our government. Hell, I'm sure that if there was a revolution, the military would probably fall apart as most would be joining the revolutionaries considering their friends and families will be in that side. And friends/family matter more than the government and a job to most people.
Still, I'm pretty sure the US won't come to out right true bloody revolt, will come to protests and then probably the government will be scared to make the changes those people want, just like in the 60s with Civil Rights and other issues in the past. Hell, our own founding fathers said the government should fear its people and the people must re-instill that fear from time to time.