I just finished reading the NYT best-seller In the Garden of Beasts: Love, Terror, and an American Family in Hitler's Berlin [1]. It made me think that, notwithstanding Godwin's Law [2], citizens should continue to be mindful of what can happen in a 'civilized' society.
[1] http://www.amazon.com/Garden-Beasts-Terror-American-Hitlers/... (not an affiliate link).
In the Garden of Beasts: Love, Terror, and an American Family in Hitler's Berlin - Erik Larson Highly entertaining non-fiction that reads like fiction. Accounts of the build-up to hitler's Germany like you're actually there. http://www.amazon.com/Garden-Beasts-Terror-American-Hitlers/...