Re: Blackmailed
You know the Snowden case is unrelated, right?
Besides, Snowden was a government contractor (like Chelsea Manning) and so at the very least broke their employment contract and a bunch of other rules. People working for The Guardian, Der Spiegel, Wikileaks, El Pais etc. were not US government contractors. That makes the legal situation very different from Snowden's and Manning's.
Besides, what happened at The Guardian was not a function of American law. It was a function of the UK being a US vassal state and the Cameron government wanting to suck up to its boss.