You're mixing up two issues. The need for oracles is a "hard problem" but it's not the problem in this case.

USDC has a central issuer that can freeze funds because that's the only way you can currently have an asset that "looks like" dollars on a crypto ledger. Someone gets a dollar, mints a unit of the bearer token, and pinky swears they'll redeem it. It's a systemic concern that calls into question the legitimacy of the system, but that's not an oracle.

>> Those persons (a judge, the police, even if robots by then) are the oracle.

they are not. The oracle is always a computer. It is a record in gov db that says you own something.

Judge and the police are the enforcers.

"Oracle" being the cover for crypto bros who dont want to admit they need "the legal system" to fix thier mess. Its all idiology and freedom when you are poor but once you actually own something of value, like a flat, suddenly you want lawyers and police to keep you safe from bad people.