The story of Ai Weiwei is turning into a dark fable that seems to belong in another age of modern history. In Bertolt Brecht's play Life of Galileo, a dissident intellectual recants his beliefs under pressure from an intolerant regime. It was a hit in the US, but Brecht, a communist, decided in spite of its success to return to live in east Berlin. Later, as he observed the absurdities of the Soviet regime, he was moved to joke that the state should elect another people.

Those absurdities are brilliantly recreated in the historically set Berlin film The Lives of Others, and anyone who has watched it must surely feel a shiver of familiarity at official news from China that Ai Weiwei is co-operating with enquiries into alleged economic crimes and bigamy. Observers who side with the Chinese government on this should be ashamed, and those who dislike Ai Weiwei's art and so welcome any prospect of his undoing are seriously confused about basic human rights. The fact is that regimes such as the Soviet and the Chinese are brilliant at exploiting weaknesses and flaws in the p