Me personally, I think it was a very troubled young man who really didn't fit into any part of society that decided that he wanted out permanently, but simply wanted to be remembered for something.
The climate of today with Americans and life (HIS life in particular), the types of people running for President, security issues, etc...all that rolled into one merely helped him with his wishes.
I just don't believe it has to be some vast conspiracy. What's the old saying, sometimes the simplest explanation is actually the correct one? That's kind of what I'm mostly believing what it was - and actually very hopeful that it was exactly all that.