Huge numbers of blacks believe the CIA created AIDS and New Orleans was intentionally flooded to wipe out blacks. A large percentage of the left, including tenured professors, believes that the World Trade Center was demolished by the Bush administration and that the last two presidential elections were stolen. Just today, Rosie O'Donnell, from her perch as a national TV host, asserted that the British sailors were taken hostage as part of a scheme by the US and British to justify war against Iran. Many people believe the moon landing was staged in a Hollywood studio.
Need I go on? I'm sure I can find some less than mainstream Libertarian views without much trouble. How about Neal shuts his pie hole, spells his name right and takes care of his own.
Some feminists believe that all male/female intercourse is rape and that men and women are identical except for a few minor details of genitalia.