Marcetic’s article serves as a timely reminder that there really is nothing new under the sun. Human nature remains a depressingly consistent factor in the way politics unfolds. Equally bracing, however, is the realisation that Hitler’s Darwinian cast of mind is very far from being dead.

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Known principally for his political commentaries in The Dominion Post, The ODT, The Press and the late, lamented Independent, and for "No Left Turn", his 2007 history of the Left/Right struggle in New...