Automated tools of warfare aren't new.
That this is brought up every fucking time a robot comes within a mile of the military is a really tired meme. Seriously. Go read every single issue of wired. I dare you to find a mention of robotics that doesn't bring up Terminator.
It's just lazy thinking.
You specifically were lazy in that we already have automated tools of killing each other and each others automated tools. It is heavy influence of hollywood that makes us think something without a human on board is fundamentaly different.
Robot armies fighting each other and super AI taking over military robots are two of the most common topics brought up in the context of military robots, and two of the least realistic or likely.
It's particularly irrelevant in a story about a mini robot used as a radio relay, 100% human controlled, with no weapons. This thing is a wi-fi repeater with a camera on top of an RC car.
Well, we're still here aren't we? Seriously though, when push came to shove (Cuban missile crisis was the closest) we (collectively) backed down. It seems nobody really wanted to fight when it meant certain death to themselves.
http://www.washingtonpost.com/wp-srv/inatl/longterm/coldwar/...
[TLDR version: Stanislav Petrov prevented nuclear war by correctly guessing that the nuclear launch his station detected was a false alarm, and not a true attack on the USSR. If he had decided the other way, nuclear war may have ensued.]
... for nations. But, one can only dream.