I think part of it is just the nature of what gets posted here. One could make the argument that articles favor sensationalism for the purpose of link-bait (or a less cynical argument might be that they subconsciously favor sensationalism to stand out from the crowd), but if a large portion of "news" is inherently inflammatory/hyperbolic, then I think a skeptical response is both warranted and natural.

Also, a lot of articles that get posted here are technical blog entries whereby someone makes a pronouncement on the positive or negative effects of some technology/methodology. These are fundamentally opinions, and will immediately garner a response from someone who holds a differing opinion.