"IS-BEs have been dumped on Earth from all over the galaxy, adjoining galaxies, and from planetary systems all over the "Old Empire", like Sirius, Aldebaron, the Pleiades, Orion, Draconis, and countless others. There are IS-BEs on Earth from unnamed races, civilizations, cultural backgrounds, and planetary environments. Each of the various IS-BE populations have their own languages, belief systems, moral values, religious beliefs, training and unknown and untold histories. These IS-BEs are mixed together with earlier inhabitants of Earth who came from another star system more than 400,000 years ago..."

-- Page 67, Alien Interview

"In addition, Earth, inherently, is a highly unstable planet. It is not suitable for settlement or permanent habitation for any sustainable civilization. This is part of the reason why it is being used as a prison planet. No one else would seriously consider living here for a variety of simple and compelling reasons..."

-- Page 74, Alien Interview