Attacking that place was a goal for months. They put it under surveillance and they waited until the optimal time. These guys were patrolling the area every day for months. That does not mean the video caused it - it means they incorporated it into their plan smartly. With all due respect you seem to want to deflect blame when I've already stated I'm not blaming anyone.
No matter how you look at it the security arrangements were very poor and totally inadequate. That is the tragedy here - that this could have been easily prevented with a minimal of foresight.