LONDON — The arrest of comedy writer Graham Linehan in Britain over social media posts about transgender people has sparked a debate about freedom of speech and its limits. Supporters of Linehan say U.K. laws are stifling legitimate comment and creating what "Harry Potter" author J.K. Rowling –- like Linehan, a critic of trans activism –- called "totalitarianism." Others argue that online abuse and hate speech have real-world impact and police have a duty to take it seriously.

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