There are different types of conspiracy theorists. Some get riled up because they are boiling over with an overabundance of emotion, convinced that the conspiracies they spout are true. Any shred of doubt they might feel is crushed by their ego and so doubling down on their debunked conspiracies is not a big deal for them. Other kinds of conspiracy theorists simply lie to garner fame and attention. Their imagination helps them cook up crazy theory after crazy theory. Kooks or not, they get the notoriety they crave for.
Here's a brief look at the hands of two conspiracy theorists.