The Times, UK February 25, 2017 Saturday 12:01 AM GMT On Tyranny: Twenty Lessons from the Twentieth Century by Timothy Snyder Vulgar and boorish he may be, but comparing the American president to Hitler cheapens Nazi crimes, says Michael Gove by Michael Gove Godwin’s law is the principle that, sooner or later, in any argument, someone will invoke the Nazis to make their point. It’s a tendency that’s also been called reductio ad Hitlerium – the rhetorical itch to compare an individual, trend or phenomenon you dislike to the genocidal German dictator.