If you're talking about the pet US fantasy of The People rising up against the Guvmint, the main thing wrong with that is that it would inevitably end with one lot of The People shooting down another lot while the Guvmint looked on and laughed. Bear in mind that most of the biggest gun fans are head over heels in love with the plutocracy, and can be reliably called out on the streets whenever the squillionaires are threatened with having to pay taxes like little people.