If a nation-state dumps crypto then they no longer have it. If crypto was overvalued to begin with they can just buy it back later, cheaper. If it was fairly valued and they crashed it unfairly, they just lost a whole lot of crypto and don't get to play in that market anymore. Same way that speculators get flushed out of the stock market: eventually you run out of money and lose the right to play unless you start making a series of good calls.
This feedback mechanism doesn't exist when money can be created out of thin air. Then, if you run out of money, you just print more.