So a government is going to spend hundreds of billions of dollars to get enough Ethereum to disrupt it, before accounting for the price going up by purchasing hundreds of billions of dollars of Ethereum, and then they’re going to destroy the hundreds of billions of dollars they invested to take the network down, temporarily. Like sure, it’s possible, but once established, it’s not happening.

It would be more cost effective to do a supply chain attack and introduce exploits/weaknesses to try and make people doubt using it, attack the infrastructure and steal coins from exchanges and other off chain services or smart contracts with bugs, and pass laws to restrict it.

edit: Oh and there’s also the queue to activate a valid staker. It will take a lot of time to even begin to be able to do this, instead of hoarding/renting asic hardware and turning it on out of the blue.