I've noticed that there seems to be a recent trend of extreme downvoting going on recently (It happened to me in the last 12 hours).
I can understand that if you disagree with a comment, you should downvote it (I personally don't have the downvote privilege, so of course I never downvote anyone) but it seems that certain members of this community have taken it upon themselves to downvote ALL comment history if they disagree with one comment.
I first noticed it about a week ago. I don't really mind, as it's just a forum, but I'd like to understand the motivation, and why it has only started happening recently.
It's really the digital equivalent of putting your hands over your ears and yelling "La La La, Not Listening".
I presume that this too will be downvoted by my unknown nemeses... ah well.
http://ycombinator.com/newswelcome.html
is downvoting of comments that are "rude or dumb." Language choice can matter for what is considered rude, and I think some of your most recently downvoted comments were rude in tone and unnecessarily harshly worded. Live and learn. Hacker News attempts to establish very high standards of civility and thoughtfulness, as the linked welcome message explains.