if something is cryptographically secure, it should not matter how big the threat actor is

any goon-for-hire can break into your house and hit you until you tell him how to get the bitcoins out

https://imgs.xkcd.com/comics/security.png

It is actually really simple, albeit tedious, to defend your bitcoin against remote state actors. Do keygen and signing with reproducibly built binaries on a reproducibly built minimal OS and never connect it to the internet.