I think their point was that these organizations are supposed to be filled with public servants, civil servants, and military/former military whose aims are the furthering of American interests. That's why they were started, and for at least some period of time (not necessarily through recent history, but maybe?) that's what they were. Honestly that's part of the argument for public servants making less money than their private sector counter-parts, that a big part of their "compensation" is being part of these huge organizations "saving America" or whatever patriotic spin you want to put on it.

Compartmentalization allows for that. You operate with orders to accomplish X, and it is more than possible to hide why you are accomplishing X.

Typically it goes like this: lobbyist meets with policy maker, policy maker decides objectives for [a-z]{3}, [a-z]{3} undertakes missions in support of lobbyist's objectives.