Most comment threads that I see on HN, by and large, contain both sides to any argument.

They're like a conversation you might have with a friend, one person gives their opinion, the other perhaps gives the opposing argument and so on.

But of course, if you take any single comment out of context, it's usually either positive or negative. There are exceptions where commenters give a more rounded, thought out perspective, but it's mainly short opinionated comments.

And that's how conversations often are; short, off the cuff remarks. Rarely carefully worded, equal handed monologues.