'Through the looking glass': How conspiracy theories wreck lives

A rescue helicopter surveys damage to the Pentagon as firefighters battle flames after a hijacked airplane crashed into the U.S. military headquarters outside of Washington, September 11, 2001. Days after the 9/11 attack, several conspiracy theories emerged and left Americans divided on factors that occasioned the attack. PHOTO/FILE/REUTERS 

What you need to know:

  • Conspiracy theories usually spread when people feel that they are being lied to, said Marie Peltier, an author and expert in the field.