David Icke, Alex Jones are involved in some way without a doubt, but they do bring some truths to add to the disinformation. I think that it doesnt matter how much truth they bring there will still be alot of people that don't like to believe that "Governments" that we see are conspiring against their own people although they have been doing it time and time again throughout history. For instance they have brought us into this economic crisis (which they are profiting out of) by insisting on having a monetary system controlled buy debt. This isn't an accident just like the wall street crash wasn't.
GCN – the network which carries Alex Jones and Jeff Rense is an ABC affiliate as in the Disney-owned American Broadcasting Corporation the epitome of mainstream corporate media which is run by the "iluminati" just like all the other major media corporations. Not only are they allowing him to broadcast this information they are supporting it. For what reasons i am not totally sure yet.
The government is just a front for us to think we actually have some say in what is happening in our world when really, the government are just bringing forward policies demanded by and which suit a very small, rich and powerful portion of the population in one way or another.
All i know is that if the illuminati or the government thought in any way they were trying to expose something that they didnt want them to, not only would they not be able to broadcast this through mainstream media, i doubt they would be around for very long.