My personal theory is that there isn't an Adam Lanza, and that he didn't kill his mom and get let in, and shoot up the office and her specific classroom with a substitute teacher. A hit squad targetted this school, and piggy backed somebody through the gate, or was let in. After they shot up the office and the classroom, they booked it, and feds moved in to cover it up. The chose the teacher of the classroom, did a quick check on her, and blamed it on Ryan, her only son. He quickly took to social media said it wasnt him. They arrested him. They said "Oh it was (first name to come to mind) Adam Lanza, and he had Ryan's ID, and Ryan is in another state"

You basically have a crime syndicate which has america so black mailed and threatened that everything becomes a matter of national security. The burden of the cover up is on the state.