Up to a point, the US is to guns as the Netherlands is to bicycles. Both bits of kit are widely owned, used and even venerated in their respective lands. Their users can mobilise powerful lobbies. On Saturday on the Haarlemmerstraat I saw an irate motorist get out of his vehicle to bawl at a cyclist. He was quickly surrounded by passers-by and forced back into his car. It was a more satisfactory outcome than some disputes between gun users. But then – and here’s where the analogy begins to give out – bikes aren’t generally designed to kill people. ‘Terrorism’ and ‘tragedy’ thrive in different semantic fields. After the murders in San Bernardino last week the media were at first stumped about whether to call it ‘terror’ or just another ‘tragic’ gun massacre.