The less we refute conspiracy theorists, the more the conspiracy theorists believe they are right, when in reality the rebuttals are simply too obvious for anyone to bother.

When we ignore them we actually enable them, and yet we can't help but ignore them anyway, because we naturally want to stay away from stupid. This creates some kind of perpetual downward spiral feedback loop type of thing that just makes the conspiracy theorists theories crazier as time goes by, disconnecting them ever further from reality...