That's why PoW provides a 51% mechanism. It works both ways, any 51% attack can be 51% attacked.
Don't make me laugh. You think you can 51% the government? lol
That's why we have an anarchy of competing governments.
Governments aren't going to be 51% attacking each other to protect BTC users' autonomy. The majority of governments work in concert with each other. "Competing governments" are an illusion.