As Drake explains in the linked video, just asking questions about what was going on - nevermind actual accusations - was enough to be excluded. We see similar behavior in police departments, where people have tried to join to add to the number of "good cops".

Unfortunately, when this type of groupthink becomes so entrenched, anything resembling a contradictory idea has to be crushed, removed, or ignored immediately. It is a basic fight-or-flight response, because nobody wants to admit they've been doing the wrong thing for years.

The solution is similar, and ideas like intelexit will help. Instead of wasting energy trying to push against groupthink, help people leave where they can form so they can form a different origination. For example, it would be nice if we had an actual agency focused on defense and the hard problem of securing computers that had even a tiny fraction of the NSA's budget.

Don't know why you are being downvoted. Spy agencies going away is a fantasy that brings into question the sanity of the believer. Better to have moral people there.