Transparent systems in which transactions are screened do not trust their people.
North Korea would never allow their people access to a truly private cryptocurrency (which Monero does better). It would become easier to funnel money internally and create opposing factions.
This discussion is no different than a discussion about just rulers. If the person in charge of a monetary system has good intentions, or is informed by a democracy with collectively good intentions, it is better for them to dictate who can have access and who cannot.
Crypto forces those on the network to trust in the free decisions of the collective. If you think more people would transact with a large criminal psychopathic state like North Korea than they would with people who oppose North Korea, that is a collective choice. In a truly decentralized system, where everyone had access (which is not the case, and complicates things), the real, in practice will of the people comes out.