Conspiracy theories as accusations and ethical problems

Conspiracy theorists are turning out to be a resilient bunch, and no amount of refutation or mockery will make them go away. It's a problem, because as well as being ethically problematic, conspiracy theories can sometimes be downright dangerous. So how do we deal with them? This week we're exploring the ways in which the familiar diagnosis of the conspiracy theorist - lacking in reason, perhaps mentally ill - doesn't really get it right.