I think the answer that it would jeopardize their source is a valid answer to that question.
Agree. Frankly, I think people who keep attacking CF for "not disclosing sources" are about as clueless as the Hashtards. In the U.S. at least, reporters have a long and storied history of keeping their sources secret and many reporters have gone to jail rather than disclose sources even when ordered to do so. A free press is pretty damn important to democracy.
Exactly. In the German speaking world this is called "Redaktionsgeheimnis" (editorial secret) and it's guaranteed by law, so journalists can *always* protect their sources.