Conspiracy theories are like Pringles. They’re delicious to consume, full of short-term hits to the pleasure centers of the brain, and you can’t eat just one of them.
We know that people who believe one conspiracy theory usually believe more than one. So if you believe that the Mafia and CIA worked together to assassinate JFK, you probably also believe that the Twin Towers were stuffed full of explosives that triggered after a terror attack the US allowed to happen. And on and on.
In fact, if you believe these conspiracy theories, there’s no reason to disbelieve any others. Why would you? Sure, some are more outlandish than others, but all are outlandish, depend on unseen evidence, dissolve under scrutiny, and fall into the realm of wishful thinking.