George Soros, Rupert Murdoch, the whole of the MSM. Tools of the CFR.
Propaganda is a specific type of message presentation, aimed at serving an agenda. Even if the message conveys true information, it may be partisan and fail to paint a complete picture. The book Propaganda And Persuasion defines propaganda as "the deliberate, systematic attempt to shape perceptions, manipulate cognitions, and direct behavior to achieve a response that furthers the desired intent of the propagandist."
Why should you be surprised that someone doesn't agree with you on every issue? There are a lot more libertarians out there that agree with at least some aspect of the "neocon" foreign policy than there are libertarians that believe in complete non-interventionism. I know some would say that those people are not libertarians but they still exist and make up a large portion of the GOP.