I think this is basically it. But they think that's the final word so get flustered when they respond with: "No you owe us the money".

They seem to believe that they can benefit from services without paying for them or following the law. Fundamentally I like the idea of being independent from the nation... But if you want to use their roads, shops, health services, etc you need to abide by their laws and terms. They think they can just say some magic words and now they don't have to. It's insanity. Very literally, they must have some notable mental health issues to think this is logical.