US military are at the mercy of their population. Think Nazi Germans with their superweapons vs punny Russians. Germans east front were utterly destroyed that it was preferably to surrender to West as fast as possible even though it came at a huge toll on Russians side. American military at most top to 1-2 millions which is only about 1-2% of their population. Whatever weapons that US military got, they can be easily commandeered by the population should it turn evil like Nazi. A lot of ex-veterans including ex-special forces are part of population who are very well verse with military tactics. Unfortunately this is uncommon in Europe or Asia side. If you reside in this places, then you pretty much have not seen some US private citizen collections that can rival 3rd world armies. Remember USA was beaten by Vietnamese. What makes you think their own citizens can't keep them in check? The parents who their children are military are part of population too. These are what most governments are scared of and ban weapons. The intention for these governments are never for the safety of their population but their own. USA people are way more smarter than most people giving credit for. They known this concept by inventing a written document that guarantees 1st and 2nd. Even UK dares not to do this even though most early Americans originate from there.