It seems fairly utopian to me, given that wars existed on the gold standard too, and if they were less destructive it was for want of technology. But maybe if I held Bitcoin I’d be more inclined to believe it was the solution to world peace.
Also, it's trivial to freeze BTC accounts too; that just means controlling the network - which in the even of a physical occupation is going to be obvious anyhow.
Then there's the fact that occupiers may be able to engage in a 50% attack (assuming occupation is large scale and impacts many miners) - and may well force usage of their fork of the chain, even in absence of a global 50% control, making the whole thing rather tricky to predict.
Let's hope it never comes to that, but I'm certainly not convinced BTC would be immune from a physically occupying force's influence. I bet it depends hugely on the details of that occupation.