I do not think they planned the out come. But the situation on the ground at the time was their plan.
And, yes. That should have been Accessory. While I don't think "they" (White House, State Dept., et al) were there, obviously by design, they did not fire the shots, light the fires, raze the building. However, they are as guilty as Bin Laden. Send in the SEALs and take'm out. The whole lot. They have committed treason.