The reason government conspiracies on the scale necessary to pull off a “false flag” attack such as Boston are so unbelievable, is that our government is not competent to pull off such a complicated plan. Just look at 0bamacare or the DMV.
Besides as Ben Franklin said, 3 men can keep a secret, as long as at least 2 of them are already dead. Like the JFK assassination and the truther crap, hundreds if not thousands of people from different governmental agencies would’ve needed to have been in on it. And every single one of them could be trusted to not let the cat out of the bag, accidently or otherwise? Hey gov’t agencies have enough problems communicating with each other under “normal” circumstances. I still remember the half-baked consp theory about John Lennon murdered by the CIA. Whoever thought that one up I wanted arrested for attempted murder. I thought I was gonna die laughing.