It seems like this is an instance of a more general trend: The commenting ecosystem is in decline. It's better than Reddit, but it's a shadow of what it once was. I've noticed downvotes are trending now. The downvotes do correct themselves... most of the time. But there's a lot more frivolous downvoting due to the influx of people that have attained downvote privileges but haven't really shunned the mindset of other…
Give me a break. You sound exactly like the elderly folks you always hear saying "things used to be so much better, nobody saying "Sir" and "Ma'am" anymore...kids these days have no manners." The commenting ecosystem on the internet has always been a coarse and insensitive place, and it always will be. This is not a new thing.
Go to the early days of IRC, BBS and Mailing Lists and see what kind of flames flew around for just asking what other people considered lame.
HN community is really polite!