Factions would form among the armed civilians and then you'd have all-out war. The largest of the gangs would take control and they'd be no better than the drug gangs who run the country now. I think cyborg assassins are a better option, because you can always hit the kill switch to deactivate them. Of course, some nerds will create viruses to take control of the cyborgs and then they will rule the country and possibly the world.