I dunno. Germany has the same kind of thing. Search for "Reichsbürger". Essentially these people reject the modern German nation, and say they belong to one reich or another - either the Kaiserreich or the Nazi one.

What these conspiracy people don't get is that a nation exists as a consequence of its subjects and warriors loyalty to it and obedience of it. It's just a power structure. All the legalities and voting and bureaucracy around it are just there because it's much easier for everyone to live with a power structure that behaves predictably, justly and generally nicely. But the legalities are not actually necessary. At the core the answer to "Why?" is "Because we can".

Note that I'm generally pro-government. I'd rather have one nice power structure to deal with than a world operating after the rules of school, where I have to protect my lunch money myself. This is just reality.