As much as people like to complain about Bitcoin's energy usage, it makes a 51% attack prohibitively expensive and if you were to invest all that money, you'd want to make money with it rather than cause a short term disruption to the network.
2. Once enforcement crashes the hash rate, fire up government controlled miners to perform a 51% attack on BTC. Repeat as many times as it takes to make the point.
The question is, which states need to be convinced to join the coalition, and how hard is that? I can see pariah states like e.g. Russia seeing an opportunity in encouraging mining instead of banning it.
And I don't think central banks would want to destroy it. In many ways, many useful transactions in crypto occur in stablecoins pegged to the dollar. If anything, central bank might want to participate and innovate with everyone rather than try to destroy Bitcoin.