Buzz Aldrin’s reaction to the conspiracy theorist who told him the moon landings never happened was understandable, if not excusable. The astronaut punched him in the face.
Few things in life are more tiresome than engaging with cranks who refuse to accept evidence that disproves their conspiratorial beliefs — even if violence is not the recommended response. It might be easier to dismiss such conspiracy theorists as harmless eccentrics. But while that is tempting, it is in many cases wrong.
As we have seen during the Covid-19 pandemic and in the mob assault on the US Congress last week, conspiracy theories can infect the real world — with lethal effect. Our response to the pandemic will be undermined if the anti-vaxxer movement persuades enough people not to take a vaccine. Democracies will not endure if lots of voters refuse to accept certified election results. We need to rebut unproven conspiracy theories. But how?