Yeah, there's no real easy way to explain it that truly covers
all of the craziness.
The way I like to think about it is like this: it's belief in legal magic. Putting aside the rationalizations,(such as the "strawman", naval court and the Magna Carta) a lot of it hovers around the notion that if you phrase things
just the right way both in your written statement and while present in court, the entire system breaks down and essentially allows you to do whatever you want.
There's a ton of rituals and basically legal spells involved which is why I think it resembles magic. This includes things like renaming themselves and then refusing to answer when addressed with their legal names in an attempt at literally separating the legal and physical personas, "counter-suing" the courts and then demanding outrageous amounts in "damages" when they don't respond and - OK, I'll touch on the naval thing - insisting that if the court has a flag with a golden fringe (which is common because hey, it looks nice) that means that the court is
actually an
admiralty court which doesn't have jurisdiction on land.
It has tons of subgroups (or sects might be a better word) which don't agree with each other. What unites them s this magical thinking and a complete obsession with it, to the degree that we see self-destructive delusions like with this woman. Oh, and a complete inability to admit that they're wrong. Hit them with a thousand examples of why their faith isn't working and they'll just respond with a thousand examples of minute things these people supposedly did wrong.
EDIT: And I do mean delusions. They don't just talk the talk, they walk the walk even if it means ending up physically harmed. Like this guy:
https://www.youtube.com/watch?v=RfVbiefMdNU
They aren't harmless themselves either. Members have been involved with
numerous murders of police officers and other civil servants who have the bad fortune of getting in their way.
The FBI treats them as borderline, if not actual, domestic terrorists.