“The decision by the (British) to colonise/conquer Australia … was the original sin,” declared the tweet earlier this month. “Britain gaining Australia for Britain was theft. Open and shut.” Its adamant author, a retired Irish civil servant, was responding to a recent podcast in which I discuss colonization with the former deputy prime minister of Australia, John Anderson. What the Irishman said of Down Under, he’d no doubt say of the True North, too.