I really like Corbett and the fact that he seems to let his work speak for itself and doesn't appear to be interested in the fame or attention makes me less inclined to think he is part of the problem but I do remember that he was quite involved with Sibel's News Bud project although I am not sure how much he has to do with it now.
At the end of the day all we can do it watch/listen to what people like Corbett/Kokesh and others have to say, do our own research and then make up our own minds.