The first thing that we demand of a wall is that it
shall stand up. If it stands up, it is a good wall, and the question of
what purpose it serves is separable from that. And yet even the best wall
in the world deserves to be pulled down if it surrounds a concentration
camp. In the same way it should be possible to say, ‘This is a good book
or a good picture, and it ought to be burned by the public hangman.’

Georg Orwell

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