Anti-Veliskofsky Theory.

Veliskofsky was a scientist from the 1950's who came up with a wild bunch of theories about catastrophic events occurring in our Solar System. He inspired a movie about people leaving our planet due to an incoming large planet sized object.

Take a look at our solar system, many planets have moons smoothly orbiting in stable orbits. All of the planets rotating on a celestial plane around the Sun. An elaborate, complex piece of clockwork moving onward smoothly.

The only evidence of a truly cataclysmic event is the asteroid field between the orbit of Saturn and Mars. That field was a planet millions, perhaps a billion or more years ago.

So, if any moran starts babbling nonsense about a scary Planet X out there. The Anti-Veliskofshy Theory is the cure.