I disagree Stephen.  Unless the CIA planted various tales in the press, I think the two brothers indeed picked the wrong target having robbed two Pakistanis in separate incidents at gunpoint earlier in the day.  I am more disturbed by the fact that a CIA assist vehicle fatally mowed down a innocent Pakistani in the street in their effort to get to Davis.  

I am disturbed to find out that some 200-300 CIA agents are operating in this remote location.  And that Davis was peddling 'how to make a nuclear weapon' to al-Qiada.  You want to know how terrorists get their hands on nukes? It is because we provide it to them.

I also doubt Davis has diplomatic immunity unless the Pakistani CIA was routinely passing them out like hall passes.  The State Dept. has been doing the two step on this.