As we saw in the FLQ Crisis and again during the G20 summit, Canadians can lock thousands of people up without due process of law. As we saw in Kansas, certain Americans can ban the teaching of established science in the classroom.
But our system at least makes these things aberrations and provides dissenters a way to rectify the problems in the courts.'
edit: I think what I'm trying to say is "Our system provides us with an undo, but it's only good when we remain vigilant against craziness. If we become complacent and assume that we as people are somehow too intelligent or too morally centered to do crazy things, wham, we do crazy things too."