Downvote for disagreement has a bit of history on HN.
PG has said gently conflicting things:
Downvoting to disagree is a problem that needs action: https://news.ycombinator.com/item?id=1057347
Downvoting to disagree is fine if people are also upvoting to agree: http://news.ycombinator.com/item?id=117171
Worry about excessive downvotes is a long term problem on HN. Here's a post from seven years ago: https://news.ycombinator.com/item?id=214398
Downvote for disagreement has a bit of history on HN.
PG has said gently conflicting things:
Downvoting to disagree is a problem that needs action: https://news.ycombinator.com/item?id=1057347
Downvoting to disagree is fine if people are also upvoting to agree: http://news.ycombinator.com/item?id=117171
Worry about excessive downvotes is a long term problem on HN. Here's a post from seven years ago: https://news.ycombinator.com/item?id=214398