Has California reached this point yet? ;)
Regarding CA, seems that the legitimate way of achieving redress of grievances is to petition, vote and lawfully seek correction, and or separation.
The DOI describes how man is empowered by his Creator to form governments for the protection of rights and liberty, so if the people of CA decide that breaking CA into several states or regional autonomies is the best way to preserve the liberties and will of the people of those regions, then they ought to seek that end. If we are talking violence and armed rebellion, I am not part of that.
The people of CA have a republican form of government, they have representation and available legal and civil courses of action.
Now, if the Executive of CA declares the legislature dissolved, and the courts and legislature do not remove the executive and restore the legislature, then they have descended into tyranny and the fedgov would be required to step in and restore a republican form of government. Right wing or left wing folks armed in the streets because they don like the direction their elected officers are heading? That’s unlawful rebellion.
If the majority of Californians want the government they have, and others cannot stand that , they have choices within the lawful construct- either active political action or vote with their feet- they can move to a more agreeable state. Of course, many would reject that out of hand, so then they can become activist and seek office, or apply pressure politically to seek change. But I doubt they will see any major swing in the statehouses or the executive or the judiciary- they are the epitome of the leftist/statist/socialist paradigm, as is IL, NJ, NY MD etc.
Unfortunately, socialism runs out of OPM (other peoples money) and fascism (govt control of private economy) is the natural result as we have seen in EUR with Hitler and Mussolini- the devolution from there is outright communism when the state seizes private assets as the descent into statist anarchy progresses.
My uneducated take on it anyway.
Uhhh ... I think I'll pass ...