I just came back to HN, and looked at there's [my god, typing "there's" feels so wrong, even though it's actually right] comment again. It was clearly satirizing the sort of inane iPhone-centric articles that get voted up.
I hate that this is the fourth or fifth time we've had a story about the guy on the front page of HN. The first one was nice, all the others are pretty much differently worded copies of the first. (Wish I had more karma so I could downvote stuff like this. -ed. Nevermind.)
More karma wouldn't give the ability to downvote a story, which is by design. If you want things like this off the frontpage, help push quality to it.
After reaching a certain level you get the ability to flag stories but its one of those Peter Parker things, not to be trifled with just because the story isn't quite your favorite of the day.
You can downvote comments after a certain karma threshold but not stories. At least not that I know of, or at least at a different level than comment downmodding.