Why do some people seem to exist in order to "refute conspiracy theories"?

[Bonobo]

What is the psychological process working behind the minds of those who seem to devote so much time to "debunking"?

Is it a power trip? Or is it the encouraging illusion that the world is entirely explicable to them?

There must be a common thread connecting these kind of people.

Perhaps it is like religion, a way of assuring oneself that the boogeymen don't really exist?

This OP, by the way, has nothing to do with the arguments on either side. My question is about the mindset of a certain subset of people.

Much like the way some on this board ask "Why do some people believe in "conspiracy theories" (a ridiculous, slanted, prejudicial question loaded with assumptions, by the way), my question, to rephrase is "Why do some people believe that everything can be explained by the known facts"?