Thank you for your answer.
I have a broader view of what could be a tribe, going beyond ethnicity.
A tribe may also be political or social or religious. An economic tribe is a class.
All of these tribes can and do fight each other throughout history, even if they are the same ethnos.
Even geographic tribes of the same ethnicity have fought each other before.
The greens and antifas may be forming tribes as well, but I believe that they are less coherent,
lacking territory, a decent birth rate, and ethnic-cultural-historical identity.
But let me concentrate on the Reichsburgers.
I believe that they idealise and glorify the Kaiserreich, and its symbols,
because this is the only way to legally express national, cultural, historical pride.
They assert the illegitimacy of the FRG because this is the best way to express profound dissatisfaction with the current regime.
(The Third Reich is totally forbidden, but the Second Reich is not.)
I don't think that most Reichsburgers are lawyers or historians.
I think that their legal theories are just for publicity, or secondary.
Their real significance is that they are forming a parallel society, because they are disgusted by current Germany.
No doubt there are some eccentric characters as well, who are voluntary outcasts from mainstream society.
I see the Reichsburgers, currently, as a small tribe of eccentrics. But what if they grow?
I heard that 1/6 of Germans are pro-Deutsches Kaiserreich, which is another way of saying anti-FRG and nationalistic.
The numbers are higher among young people.
https://yougov.de/politics/articles/...narchie-zuruck