One of the main ways in which Enlightenment thinkers approached the study of government was through a "rational" and "pragmatic" lens, in which they questioned the status quo of monarchies.
It depends on your definition of hero, I guess. The fact that Gandhi and MLK did not use force to advocate for their opinions was mature and moral. They did not give up the first time. But maybe if the cause is correct, one might have to break the stated law, and become a hero.
Do you mean the fugitive slave act? If so then it is false. The fugitive slave act states that a slave is required to be returned to their owner even if they live in a free state.