He, you know how those cartoons came about, dont you?
During the whole UFO craze the gov was getting nervous and wanted to ridicule the UFO movement.
So they went and asked whether entertainment industry could help them out there, and make some nice cartoons which made aliens, UFO's and people that believed in them look so silly that nobody would believe in it anymore.
It worked partially. People mindlessly utter the words 'little green aliens' (cartoon reference) whenever confronted with a 'believer' like a sort of magic incantation that make all those tin foil lunies go away, yet the group that believes in them has increased.