The thing about zealots, conspiracists, monomaniacs and cranks is their initial reasonableness. Few of them start off a conversation with their most extreme opinion. Their tactic is to establish common ground first, as a salesperson gets a customer saying “Yes” to some opening questions. Only then does the zeal seep through, by which time it is too awkward to dissent. So, cornered at a party, I might endure the following exchange:
Crank: This Sadiq Khan is a useless mayor.
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