A) HN users want in depth, rational discussion.
B) HN users want a pro startup environment.
B means users will favor optimism and discourage anything cynical. A sometimes requires what may look like cynicism.
These two interests are therefore in conflict and will cause irrational behavior:
http://news.ycombinator.com/item?id=148830
xLnt has raised a valid issue, but most went with a knee jerk response. I am surprised that this happened, especially since pg's article is on the front page.
So the question: what is HN essentially about, startups or discourse?
This is an important issue. If it is not dealt with, the community will default with B and discourage the users who come here for A. However, HN's lasting value lies in a community that can converse well with each other. Otherwise, I fear HN will become a guru culture and lose the ability to buck the system.
In short, it will no longer be worthy of the name Hacker News.
But, to answer your question, I don't think there are conflicting interests here. People who favor "B" will (hopefully) learn over time that their interests are better served by considering all arguments. Provided of course that those arguments are actually well-reasoned and presented, and not just "No, u r dumb".
"Pro Startup" does not have to equal "sugar coated happy you-can-do-it" comments. In fact I would think most true hacker types would have gotten enough of that bullshit in school and would crave honest feedback.