It's the same for many other things on Hacker News. Where it seems like everyone is dissatisfied with higher education, or the federal government, or the evil large tech companies.
It's unfortunate because it leads to the impression of a "strong negativity bias", which is true in a Cunningham's law sense but gets complicated because people also negate the negativity: https://news.ycombinator.com/item?id=16677130. It's quite typical for top comments to be objections of the form "I can't believe the comments here are so negative!"
