To me it presents an alternative view and interpretation on the article. Even if I don't necessarily agree with some of the sentiments and/or how opinions are phrased, they do remind me that I should read things with caution, which is probably something that even the most cautious of us need to be reminded of every now and then.
I'm not entirely sure at what point one can start downvoting but I vaguely recall that it's a privilege that's given for having been recognised for a certain amount of contribution (presumably due to points). For this reason it seems irresponsible to downvote something, without commenting, just because it doesn't match your worldview and that you are too lazy to think of it as an opportunity to at least think about why there are people thinking differently.