Here are some facts such as I have gleaned.
-The first bomb was a planned by the authorities and did no real damage, but we did get those super-shocking photos of the double amputee and fake blood. The second bomb was a real bomb.
-The suspects went back to their lives and behaved normally for 2 days before being involved in a shoot out.
-The bombing suspects had family ties to the CIA.
-The authorities refuse to answer questions about drills running on the day, or to acknowledge any of the crowd-source detective work, despite rhetoric to the contrary.
-CNN interviewed the same woman at the scene of 2 different horror stories, pointing to a disturbing trend of ‘staging’ news reports

These facts don’t suggest to me “the authorities colluded with the terrorists!”, but rather “the terrorists are deeply embedded in the authorities – again, and the media is at best useless, at worse, complicit”. Mainstream media is adding to the confusion by throwing up lots of dust, following only certain leads and ignoring what the rest of the world is saying. For example in this matter of house-to-house searches, the serious constitutional issues were not raised, but instead it was presented as model citizens cooperating with a heroic police force.