In my opinion, this is because there isn't a downvote button on stories.

Because there isn't a downvote button on stories, posting a comment that disagrees with the premise of the story has become the de facto "downvote" button.

It's easy karma to get, all you have to do is disagree with the sentiment of the post with barely more detail than "no, I disagree".

Then, when people come into the comments to argue that they don't agree, they see that there is already a comment that says essentially what they want to say so they upvote it.

The newest type of default comment that we're starting to see is the "disarming comment". On reddit this showed up as pun threads. I'm not sure exactly the form they will ultimately take here, but they're usually pretty highly rated as well. In any contentious thread there will be supporters by way of upvotes, detractors by way of the critical / skeptical comments, and people who attempt to make peace with comments that are either light-hearted or attempt to be conciliatory.

It's not just an HN thing though. Any community has these sorts of behaviors. It's just that there isn't a default way for someone to register their disagreement in the same numbers of ways there are for them to register their agreements; especially since comments that do nothing more than agree whole-heartedly with the submission and add nothing new to the conversation tend to stagnate or get downvoted.

%^@&&(*%^@%@!

pg, please, please get the people building awesome tools to become ridiculously profitable like Wufoo! I so wanted to use 280 North but I was scared they would get bought and vanish. My fear came true. EDIT: Half true. No word yet on what Motorola is going to do with them.

Congrats to the 280 Norths, YC, and their other investors. Let's all join hands and pray that Motorola allows development on Cappuccino et al to remain public.