You can bomb people into oblivion but if you actually want to control them, most of the things that give superiority to a fixed group of rich are useless. Violence is still democratic if you're trying to get anything useful out of the people you seek to control. If you have 5 people and 3 of them are slaves with an AK-47 and a donkey, you have 0 slaves not 5 slaves.
Obviously the rich/powerful can't stay that way in a glass desert with no plebs to do their bidding, at least for now, so most of the technology the government and rich have are useless for subjecting a hostile populace.