Comment by Bluestrike2

From their perspective, why not tackle the additional attack vectors?

As for the internal mole, I'd imagine that any such individual's role would be highly focused. They'd be used to tackle specific target information rather than the wholesale siphoning tapped cables would provide. Aside from the simple logistic issues with the sheer amount of data they're tapping, I can't imagine how anyone could be in a physical position to do so across the entire Google network without tripping at least <i>one</i> internal safeguard?

For bulk collection, the taps enable surveillance without the possibility of detection unless the NSA screws the proverbial pooch. And if there's one thing history can tell us, it's that surveillance agencies will spend obscene amounts of money in pursuit of that undetectability. From the Project Azorian with the Glomar Explorer to the Berlin tunnels in Operation Gold, the Cold War alone proves the point.