Michelle takes a close look at the conspiracy-theory impulse on the Left, Right, and fringe today in her syndicated column. Whether one thinks that Sarah Palin has to prove her maternity of Trig or that Barack Obama has to produce a witness to his birth in Hawaii or that the 19 al-Qaeda terrorists actually flew commercial jetliners into the World Trade Center and the Pentagon, the real truth is that these conspiracy theories become belief systems based on conjecture and speculation rather than actual facts and evidence: The plain truth will never mollify a Truther. There’s always a convoluted excuse...