Now I love my conspiracy theories... they get me thinking outside of the box. But when the attack was first announced, the first thought that came to my head was that it read like a scene in Matthew Bracken's: Enemies Foreign and Domestic. A false flag attack used to bring about an uproar and start an anti-gun movement in the country.
The baby steps toward banning the 'bump stocks' will be considered a victory by some, but in reality it will do nothing but tighten restrictions just a tiny bit.
It is a shame that people lost their lives to this guy (patsy or not), but if it is indeed a psy-op that was done, then it was our own government shooting its own citizens. That concerns me greatly.