Well, one thing can be chalked up without a doubt to this point and that is that the FBI is essentially the acronym agency in charge of managing impending and active tragedies so as to instill optimum fear and maximize the resultant clamor of the sheep for more authoritarian rule.
It appears that this agency has actually aided and abetted more American deaths on an average basis than AR style weapons have for at least the last 2 decades, by an order of magnitude...
https://www.freerepublic.com/focus/f-news/3642788/posts
amazing and weird story - also see the police report