Cheaper than just hiring out a botnet?
And there have been voices high up in the government saying that the US needs to develop offensive cyberwarfare capability. If that's not a call to develop state-owned botnets... the people in charge don't understand technology.
Of course, the use of the term cyberwarfare might be a giveaway anyway.
In any case, I'm sure it's a pretty simple matter for some people in the CIA to quietly hire out a botnet.