I don't think the thesis that a government will be able to do something will ultimately hold. I don't see how they can avoid "going dark" in a democracy.

we live in a world where the government can't even do much about illegal drug markets anyone can access by downloading a piece of software.

if they pass laws that mandate backdoor access and block software which doesn't conform more and more people will move to the dark networks.

and if they effectively block the dark networks (in the limit they will have to block all encrypted communications) then we will be living in a tyranny.

freedom is messy. accept that digital crime can only be solved when the criminal makes a tangible mistake. LLM's will be building profiles on criminals to help with identifying mistakes.