It's unhealthy in a political sense to never listen to counter evidence or people who disagree with you. You can ignore crazy people like Republican politicians, but you should listen to people with reasoned arguments. If only to better understand why you disagree with them, it's a good thing to get different perspectives. Try it sometime.
Sure, you can get that from reading blogs, articles, books, etc. Doesn't mean you need to live with people with different views.
None of that compares to what one may end up overhearing on commutes, or at work, or *gasps* a conversation that ends up going that way for whatever reason.
Not all spoken political views come from direct speaking.
There's simply something to be said to seeing the intent dripping off how one speaks as well as the quality of the argument itself...that other media simply doesn't get. Especially the internet where the freedom to say something truly outrageous exists thanks to anonymity.
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