I suspect that it's some of column A and some of column B:
I haven't seen any confirmation of McAfee malfeasance; but the NSA's interest in not having fed malware flagged as such would be obvious, and their value as free (and talented) advice on malware that they don't approve of is probably worth something, so certain suspicions arise.
As for the 'overlap/control', I wouldn't really call it "soviet-style" (in capitalist America, the 'regulatory capture'/lobbyist-driven spending model is probably more accurate than the state-owned-and-politically-controlled-industries Soviet model); but the 'revolving door' between public and private sector positions creates strong financial and social ties between state agents and private sector actors who do business in places where the state is active as a customer or regulator. Even in absence of direct suitcases-full-of-cash type payoffs, people are social animals and cover for their buddies.
What I find most baffling is not that McAfee would prefer that the matter not be discussed; but that they'd be dumb enough to risk the Streisand effect: So, either a computer-nerd museum puts up an exhibit that includes some stuff that's already been splashed across the net and the newspapers and some people who, for the most part, probably had already heard about it, see it again. Or, "American Security Corporation Censors Museum!". Who came up with that plan?