A conspiracy is a plan carried out by a group, usually clandestinely and usually to the detriment of others, and they are very common (fake electors scheme, Northwoods, sea spray).

But most people “don’t believe” in conspiracies, which means they 1) don’t believe in people making plans and carrying them out, and they 2) don’t believe in objective, historical fact.

To live in the world and refuse to acknowledge how it operates and how other people operate must be very confusing.