I'm certainly up for conspiracy theories - but, like the Sandy Hook theory - I just don't think they could get away with something like this for very long. To pull it off, it would have to have been put together long ago - to establish these "actors" in long-held jobs, schoolmates, neighbors, family, etc. Especially in a place like a small town outside of Roanoke, Va. People know everybody in these places - you can't just come in with a new cast of characters and act like they've been around for awhile.
Now, if you ask me if I think a person that is being counseled and/or medicated by a mental health professional with an agenda - if they would be capable of planting a seed of violence in a disturbed person's psyche for the purpose of instigating a violent event which could be used to sound the battle cry against guns - or to stir up racial hate.........
I've been open to that theory for a long time.