Commenter claims: . We often forget that the NSA has two missions, and they are exactly the two things that Bruce argues cannot co-exist: To secure the computing infrastructure of the US against foreign espionage, and to provide espionage on foreign communication.
Had you ever worked at the NSA, or served in military intelligence, you would know better, as their two missions are financial intelligence acquisition for the money masters, and command-and-control of the populace. Sometime you might study the history of who founded the American intelligence establishment, or else peruse the three chapters on the Kennedy administration in Richard Parker's outstanding biography of John Kenneth Galbraith.
