[Ditto]

A just cause would be when the the government betrays its principles.

I'm not sure what that means. Governments operate on laws. Nations can have 'principles' as embodied in culture or in the people themselves, but governments can only work to those principles within the law. In 1860, we had a "Nation Principle" that all men were created equal under the law. The "law" under which the government operated, however, said something else.

[Festa]

The government promises that it will uphold the first amendment. No laws are made to revoke the first amendment but the government ignores it and tramples over it. If this is the case, a state elected civil government can vote to leave and that is moral.