Know Thine Enemy (Not)

Daily Kos has a post up about a Fox News Blocker. I don't have a problem with the fact it's being made and people are using it, that's their perogative. But I would pose the same questions to those people that I pose to religious conservatives who advocate never listening or talking to people of other religions: 1) Doesn't that show an inherent lack of faith in your own viewpoint? That you don't think it will stand up to scrutiny? 2) Don't you want to know what the other side is saying/doing so you are prepared to answer it? It could be insidiously clever and if you don't get original source material, you'll look like an idiot trying to rebut it. 3) Isn't it rather ignorant to never listen to anyone who doesn't agree with you? What if, on some minor point, you've misinterpreted something and you're actually wrong?