Commenters: To state the obvious, this is an inflammatory topic. If you post a comment, make sure that it is a thoughtful one.
Readers: If you see a comment that is not thoughtful, please downvote it. Most comments in this thread so far have not been, so you have your work cut out for you.
In extreme cases, flag the comment. To flag a comment, click on "link" to go to the item page, then look for the "flag" link at the top. As a calibration hint, I haven't seen any comments in this thread that deserve flagging. But I can't read them all.
As I hope everyone knows by now, we're experimenting with ways to solve the problem of toxic comments on Hacker News. I believe that the community has to solve this problem, rather than us imposing a solution. Consider this our appeal to all fair-minded readers to pitch in.