“The restrictions for leaving and entering have not been imposed on them externally, this attitude of Korea predates even the Roman empire” =/= “we know they don’t let people in because they’re isolationist”
They’re isolationist because it’s a cultural value derived from their location relative to their neighbors. And again, it predates the Romans. There’s nothing in my comments that make it circular, what I say is intertwined with multiple sources, some unseen, combined which wouldn’t allow me to be circular.
I’ve hyperlinked to a few sources. I can hyperlink to more as well. Are we basing validity of sources based on fame? How many others agree with it? How many narrative holes their messages have? How old the sources are? Their nationalities? Whether they’re blocked where you live?