Governments are far more answerable to average citizens than the people behind Tether or the whales currently, even if government isn't ideally accountable. Also, governments have reasonable incentives to keep currencies at levels that maintain economic conditions. Being voted out or overthrown are consequences of economic mismanagement.
True, but the fact that government regulation is needed kinda voids the argument that crypto currencies are great because they can't be manipulated by the government like a fiat currency.