Slight tangent: What is going on with the HN post ranking system? This post is showing in rank 2 with over 400 points while being submitted under an hour ago, while the IRS post at number one right now has barely over 100 points and was submitted over an hour ago. This post is both fresher and with more overall points, shouldn’t it outrank?
If a story has a lot of people starting flame wars, it often gets knocked off the front page. Duplicate or similar posts with a lot of traffic, will get merged or one will be picked and the others pushed off the front page.