https://en.wikipedia.org/wiki/Jim_Crow_laws
https://en.wikipedia.org/wiki/Letter_from_Birmingham_Jail
One has not only a legal but a moral responsibility to obey just laws. Conversely, one has a moral responsibility to disobey unjust laws. I would agree with St. Augustine that "an unjust law is no law at all."
-- Martin Luther King, Jr.
These are the folks who led the Revolution. These were not the downtrodden. These were not the oppressed. These were people who stood to lose huge amounts of wealth because of the King's policies. And so they fought a Revolution. Which was, by the way, not very popular. Sixty percent of the colonists either were neutral or opposed to the Revolution.
http://www.econtalk.org/archives/2016/12/bruce_bueno_de_1.ht...
I also hope I never live in a place where because the majority are neutral or opposed, that unjust laws go unquestioned.
This is an important distinction to make when one is attempting to argue from authority, and the simple list of Wikipedia pages you linked to above is a weak argument from authority. Without an accurate portrayal of what that authority was, what its goals were, and what it actually believed, one cannot make a good faith argument.
One example being Benjamin Franklin's often cited quote about those who give up liberty for the sake of security deserving neither. This is often invoked as a warning about the inherent harm of trusting the state, when in fact Franklin was arguing (in a very specific context regarding taxes to fund a defense against Native American raids on the frontier) against the "security" of personal defense versus the "liberty" provided by the state. While the core argument being made in the fundamentally modern reinterpretation of Franklin's words may be legitimate, one cannot ascribe that intent to Franklin's words without engaging in revisionist history.
To use the American civil rights movement as an example, both sides considered themselves just, and considered the laws they disagreed with to be unjust. It cannot be the case that any law considered unjust by any party is equal to any other in the degree of its injustice, otherwise one could argue that those who considered laws against segregation to be unjust were morally equal, and equally justified, in their opposition as those who fought for segregation's end.
What one considers to be unjust, and why one opposes that injustice, should be relevant to the conversation.
The system is not totally broken.
If the law is wrong you should be trying to change the law WITHIN the law first. That is happening in all of your examples above.
The law is just that, the law, it has nothing to do with what's right or wrong.
That there are bad actors out there, and those who defend them by shouting about bad law, doesn't tell us anything about the justness of law, or the character of people (aside from the shouty ones).
I do believe in a moral good to violate unjust laws. It isn't always worth the tradeoffs, some people have obligations that weigh heavily in the decisions, and there are countless other concerns, but the fact remains, law and morality are at best only vaguely related.