i should probably flesh out my reasoning more on this but i think we should preserve the ability for people to do wrong rather than trying to box it out. practically, it functions as a useful last resort of the system is very screwed up and we can probably punish noncompliance in other cases.
i think if we successfully remove the ability for people to break laws, regardless of whether it's done in a "privacy-preserving" way, that would be bad. but then again i'm against the feds knowing who anyone is so i'm probably biased.