How bad would government really need to be before it gets to the point where crypto becomes a necessity?

In classic understanding, governments power is tied to its money. But America's status as a super power is partly tied to the direct control of the dollar but I would argue more so that our strength comes from law. Our laws, in large, are equal and everyone is held to the same standard. To that effect, we all trust that laws keeps things fair. And fair means equal opportunity.

Although none of this would be possible without control the world reserve currency (the usd) , the reality is that we could be an equally powerful nation if the monetary standard throughout the world shifted to a decentralized currency.

My only fear is the unknown. What power does anyone weild to control prices? We would have no power to adjust interest rates or anything of that sort.