The problem is that tanks and jets are pretty good for larger scale destruction, they aren't so good for keeping a population in check. For that you need soldiers on the ground, and that is real hard to do if you are literally getting shot at from every windows (the US doesn't have 10,000 armed citizens, it has more like 100,000,000). I mean yes, ultimately the government could (in theory, if the soldiers would obey) simply turn its nuclear weapons on the citizens and level all the cities. Ok fine, but to what end? What do you get as ruler of a glass radioactive parking lot?
The US military is well equipped to unleash destruction, as we've seen. However they are not well equipped to do an occupation, as we've also seen. So it would be rather difficult for the government to suppress a massive rebellion with high tech weapons, and not also annihilate its cities at the same time.
Also you might ask how useful the planes would be if a massive armed force attacked the airfields and so on.
Large amounts of people with small arms are quite an effective guerrilla force.