If one were to tell me that this was a bad government because it taxed certain foreign commodities brought to its ports, it is most probable that I should not make an ado about it, for I can do without them. All machines have their friction. . . . But when the friction comes to have its machine, and oppression and robbery are organized, I say, let us not have such a machine any longer. In other words, when a sixth of the population of a nation which has undertaken to be the refuge of liberty are slaves, and a whole country is unjustly overrun and conquered by a foreign army, and subjected to military law, I think that it is not too soon for honest men to rebel and revolutionize. What makes this duty the more urgent is the fact, that the country so overrun is not our own, but ours is the invading army. –“On the Duty of Civil
Disobedience,”

Henry David Thoreau

Which reason does Thoreau give for the idea that revolt is justified?

Rebellion is the citizens’ urgent duty.
Citizens are aware of the right to rebel against an unjust government.
Most citizens deem the government’s actions tyrannical.
Oppression and robbery have become institutionalized in the government.