It is tempting to laugh at the QAnon conspiracy theory. Millions of advocates of this fairy-tale, mostly in the US, believe that Satan-worshipping elites — including liberal Hollywood actors, paedophile Democratic Party politicians, and blood-sucking business tycoons — run a ruthless global child sex-trafficking ring.

It is likewise hard to stifle amusement at the surprisingly widely held notion that a flesh-eating extraterrestrial elite is trying to enslave the human race to access a ready supply of human blood. The most prominent member of this race of lizards is apparently Britain’s Queen Elizabeth II...

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