I thought this as well for a while, until I had some (thankfully limited) contact with the federal machine during weev’s trial.
What happens and what is said as truth in federal criminal court has very little to do with objectively measured reality.
Except of course that these are normative arguments; you clearly feel that, fundamentally, someone speaking at Pyongyang blockchain conference deserves to be prosecuted and possibly convicted, and you feel that this would be just regardless of what a court might ultimately decide on the matter (since you ultimately don't know the outcome).
Some people apparently feel that the guy should not be prosecuted or convicted based on the actions he has been accused of; if there is a law that says otherwise, then maybe the law is wrong.
Others might fear that what they feel can be an inhumanely cruel system will come down on a person in a way that will not serve justice. And who can blame them. Frankly, those people are the ones with a functioning moral compass.
How many millions of people have they "come down on in a way that did not serve justice". Aiding such a brutally repressive regime should absolutely be a crime.
And yes, the world is not perfect, and many nations get away with similar sorts of crimes (although almost universally on a smaller scale), that doesn't make him some sort of good guy.
Last I checked, not everything federal prosecutors say turns out to be true.