This is the problem, at least in the UK, an 'opinion journalist' can state:
"The facts are, Jesus rode in here on a unicorn last night, twinkies cure cancer and Obama is a shape changing lizard." ... and that's just fine, no-one can complain that they're being misleading.
From what I've seen of Fox, similar rules apply. Sometimes, when things are really shitty, and there's nothing that can be legally done about it, I don't blame people for taking it into their own hands. The protestors are harmless, and if Fox have a couple of hours downtime on their site and O Reilly finds a human turd on his car's sunroof, I'm fine with that.
From what I've seen, and I admit to being across the ocean here, the Tea Party started out with a similar position to the current protestors, being against the bailout of the banks and against throwing all our money to those who fucked the world over. Fox News seemed to swing that idea around to a general anti spending any money on anything idea, channeling their protest into an anti Obama, anti healthcare message over time.
Sure there's freedom of speech, but when one side has their speech coming out of a hundred million speakers, and the other has a few hundred in tents, I don't blame people for thinking it's unfair and wanting to side with the underdogs.