Name a civilian whose name was disclosed by Wikileaks who has since been killed by enemy combatants. Surely to god some journalist somewhere has looked this information up and written an article about it.
Well, that's it - assuming the likely scenario that nobody Wikileaks has named has come to harm, you don't really have a story.
Even if you had a story, it still doesn't stop the FUD if it suits the news outlet's agenda. That much is obvious from casual analysis of most stories among different news sources.
How would you find out? Information coming out of Afghanistan is sketchy, there are very few journalists on the ground, we don't have lists of every civilian who gets killed.