Addressing your last point because I'm not informed enough to argue the first questions: They differ only in the amount of space it takes to give an example. Imagine a loved one being held as leverage to force you to kill someone. You could beg/plead/bargain to avoid it, but if the only email that's published is the one that says "it's done. he's dead" that strips away a significant bit of context. Now, scale things up to state-level complexity and imagine being able to cherry pick the context in which things are said.