I think of them as coming from an Oort cloud of idiots. Occasionally they become attracted by our gravity, causing them to fall in and fly past. Most simply bugger off back to the shadows of the outer internet system; but sometimes they hang around longer than is welcome or necessary, dropping shit everywhere.
At the age of five, Skagra decided emphatically that God did not exist. This revelation tends to make most people in the universe who have it react in one of two ways - with relief or with despair. Only Skagra responded to it by thinking, 'Wait a second. That means there's a situation vacant.'