At Sunday’s memorial for the rightwing activist Charlie Kirk, Donald Trump paid a peculiar tribute. Having quoted Mr Kirk’s words of forgiveness, he put aside the script. “That’s where I disagreed with Charlie,” he said. “I hate my opponents, and I don’t want the best for them.” It was a stark and clarifying admission. Mr Trump does not seek to criminalise hate speech so much as to criminalise speech he hates.

The US is being dragged into a state of emergency. Speech is framed as terrorism. Satire is rebranded as enemy propaganda. Employers punish workers for personal posts. The predictable result is a chilling climate of surveillance and reprisal, in which citizens learn to keep quiet. The assassination is not just being used to police manners; it is being used to........

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