I have to argue that the downvote button serves an important role, much like the dislike buttons on Youtube, because it gives people a choice, a choice
not to use it. Youtube has a reputation for trolling, but the like/dislike ratios tell a different story. The fact that the likes far, far outweigh the dislike on almost every every video shows how good and supportive the Youtube community really is.
If every one of those dislikers, few as they may be, had posted a negative comment it would have created a much more negative atmosphere. If every one on Macrumors who wanted to downvote a post writes a negative comment instead it would start a full-scale flame war.
In future if I don't like a post, I'm just going to quote it like this and add a little down button, and see how that goes.
Image -1