contrary opinion is in error, the airing of it may help to remind people of a truth and prevent its slippage into an ignorant dogma which may in time – if unchallenged – itself become lost.2 Abiding by Mill’s principles would appear to be hard for many people today. Harder, indeed, than simply changing dogmas. In recent years the accepted opinion on gay rights in America, Britain and most other Western democracies has shifted unimaginably, and for the better. But it has moved so swiftly that it has also seen the replacement of one dogma with another. A move from a position of moral opprobrium
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