Allow me to try and explain this by analogy:
If I'm a regular customer at a bar, that's one thing. Maybe I have a drinking problem, or maybe I just don't want to drink alone.
If, on the other hand, you see me regularly entering a bar, and the bar is owned by a guy who is affiliated with an organized crime family, and the bartender is dealing in meth amphetamine, the bus boys are selling crack cocaine, and one of the cocktail waitresses has a good connection for heroin - and you see me entering that bar because you have it under surveillance - don't you think it's a good idea to find out who the f*ck I am and why the f*ck I'm spending my time at that bar? What else am I up to, and with whom?
And that, my friends, is all I'm going to say about Major Hasan right now, except to offer up my current bibliography...