We know that Isis has been using the internet and social media to encourage Muslims from around the world to go on killing rampages. We've seen this play a role in several attacks and attempted attacks, such as San Bernardino, and the attempted attack that occurred in 2015 on an art exhibit in Texas.
Does a person have to belong to an officially recognized terrorist organization to be a terrorist? Timothy McVeigh was certainly a terrorist and I'm unaware of him belonging to any such group.
There's a bit of a problem these days with the use of the word "terrorism" and/or "terrorist".
Some use it to refer to an organized group in some way actually using their power to make a mass tragedy occur, truly having a hand in it.
Others use it to refer to an act where there's a reference to an ideology of some kind by the perpetrator, even if no organized group took actual part.
And then there are those who use it to refer to any activity perpetrator where people experience terror in that act.
No matter what the nature of the perpetrator, those at Orlando's Pulse nightclub were in terror during the ordeal.
One might argue that McVeigh wasn't a terrorist because his attack happened so fast and then was over .. then again, many of the survivors were in terror for awhile afterward, if they weren't to deep in shock.
I think the word "terrorism" and/or "terrorist" may have become such a large umbrella word that it's lost specific meaning. For some, use of the word is like deploying a cluster bomb -- it'll hit someone in some way.
I think everyone is apprehensive of copycats or ideologues or those suffering a pathologically great degree of idealization or contempt for a parental figure they might act out from ...
If we try to think about what preventative measures we can employ to guard against terrorism and terrorists, I'm not sure there's much we can do when we think of these words in their new big umbrella meaning.
In Omar Mateen's case, the FBI had been watching him. A lot of good that did. What about the more silent first-timers -- when they did their deed, the Columbine shooters terrorized their school, but they were prior unknowns, and, they weren't associated with any group that had any real hand in their act.
Thus I really believe that we would all be better served with regard to the use of the word "terrorism" and/or "terrorist" if we restrict that use contextually to mean that a specific group had a real hand in the relevant act .. like al Qaeda had in 9/11 .. .. and, no, ISIL "taking credit" for something they really had no specific hand in or "applauding" the act would not cause the act to be "terrorism".
I believe the suggestion I'm making here would be helpful in not rendering the word "terrorism" and/or "terrorist" almost non-specifically meaningless.