Yeah. The worst of it is the corollary - you need to fire people that are ideologically impure. If people openly start talking about how they consider the Constitution to be an important document that needs to be protected by individual actions, then they can easily find an ally to make up the second person. To make the two person rule effective, you have to eliminate anyone that openly admits that they may very well break the organisation's rules in favour of the Constitution.

That will be the NSA's finest hour - firing people for stating that they support the US Constitution...