"Why don't gun advocates fight for the right of private citizens to own large tanks and atomic weapons?
Because that's insane?
It depends on the Megatons.
I think you are quite deluded if you consider the "Arab spring" s/t real. It seemed to me more like regime change directed from abroad in one way or the other (blatantly in Libya and Syria, more subtly in Egypt and Tunisia) and much more deluded if you believe that police and armed forces are intended for the "protection of the community".
"Hey guys, I have an idea to permit atomic weapons to individuals, let's just put a limit on the megatons their bomb can have!"
As for the Arab spring, I have a couple of friends from that part of the world (Tunisia mostly), and that revolution was real. The people was sick of that regime, and they really had nothing to lose. As for the new government taking place, on that, I agree that there is a lot of small politics behind closed doors. But there's never a conspiration for a revolution, people revolt when they had enough, you can fake that.
Deluded about the police and armed forces? It depends on the country, sure, but not in mine, certainly not. Sure, there's always a bunch of bad apples and bad situation, but in general, I'm really satisfied with those forces.