If my family had been put into a Concentration camp and the Government was moving against the "Mutants" in a similarly racist way, then I would get Nightcrawler to teleport into the White House, assassinate the Secret Service, and then get Mystique to assume the role of the US President, then just keep things anti-mutant for a couple of months so no one got too suspicious, before a change in policy.
As soon as your Government stops affording you the rights of a Citizen you can do anything you choose to against that Government as they are no longer your elected representatives. By this I mean I am not advocating anarchy against the State if your chosen party fails in a democratic election, but the acceptance that "the law" is (re)defined by Government ostensibly on our behalf and not for totalitarian reasons.