> So, civilians owning tanks? Predator drones? Attack helicopters? Cruise missiles? Fighter jets? Biological or chemical weapons?

We don't need any of that stuff to keep the balance. Iraq, Afganistan, and Vietnam are proof of this. Insurgencies are extremely effective against our military. The only real requirement for them to exist is a sufficient quantity of small arms, and maybe some improvised explosives. The argument is still very much relevant. What's happening in Venezuela right now would not be possible without having first disarmed the populace.