The conspiracy theory crap is just that...crap.
Don't you think if a terrorist organization was really behind it that they would be pushing the message that this guy was really one of theirs and the US government is lying to the people?
Yeah, ISIS is just laying low while the FBI denies their involvement...and letting them do it.
Let's stop the crap and focus on the victims of the tragedy. They deserve our attention far more than wild theories do. We need help them heal, and this crap doesn't enable that to happen.
The time will come later to discuss what to do about preventing it from happening again...after we know all the facts. Until then, there are people to care for who have had their lives totally destroyed...and they need all of us to help them.