The thing is, drones and robots work pretty much the same way. They work much more that way, actually, because if you find a vulnerability in one, it's likely present in all of them since they all came off the same assembly line. You don't have to kill all the drones, you just have to kill the ones guarding the drone control facility, or convert the drone operators to your side.
The most dangerous thing about robot armies isn't that it will make governments too powerful, it's that a terrorist could take control of them. And the only way to prevent that is to not build them.
(Once a society has achieved democracy, the equation may be different (and closer to what you are saying). However, only a small minority of human societies have achieved democracy.)
TL;DR: fuck it, print weapons
I'm sure humanity will find some
Be specific.