In order to determine the morality of the hypothetical shooting, you must establish who morally deserves sovereignty over Iraq and Afghanistan. (An inherently political question.) If America deserves sovereignty, you're right, it's like releasing documents from the WPP. If the insurgents have sovereignty however, it's akin to releasing documents detailing a drug smuggling ring.
So in short, you ask us to take politics out of the equation, and quietly assume your own politics as a given value.
To take politics out of the equation, suppose this was a leak of all the documents from the Witness Protection Program. Now all the information about everyone who has ever informed on anyone within the US criminal underworld is out in the open. If they get shot then yes, the moral responsibility for that shooting lies with the guy with the gun, but that doesn't absolve the person who released the information from any moral liability.