Just wondering, what's the reasoning for not applying more heavy handed moderation on which stories get dumped off the front page? Why not manually suppress a submission when you think the comments are likely to be of low quality, rather than leave an unrepliable comment at the top? A more curated place would be welcome, in order to stave off some of the eternal September-ness places undergo. There are other places on the Internet to have those discussions; HN doesn't have to be the place for that. There seem to be quite a few submissions on the frontpage these days that would fall under the "If they'd cover it on TV news, it's probably off-topic" section of the guidelines and all I can do is flag them when I see them.
Moderation is soft power. People think we have the power to be heavy handed, and a lot of users think that's what we do (just look at threads like this one), but we don't and we aren't. Mostly we just try to please the community, while doing our best to foster the mandate of the site. Of course this is impossible; the community can't be pleased, because different people want different things and many are incompatible. But if there's a way to keep it least-unpleased, that's what we're going for.
The posts you're asking about are in the vexed category where parts of the community feel they absolutely belong on HN while other parts believe they don't. Not only that, but the topics themselves have contradictory qualities: they're partly intellectually interesting, partly sensational gossip, partly a political slugfest. Unfortunately the slugfest is dominating everything else right now. I wrote about this here: https://news.ycombinator.com/item?id=33992824. That's also why I pinned https://news.ycombinator.com/item?id=34010948 and https://news.ycombinator.com/item?id=34010908 to the top of the two threads last night.
I don't know if that answers your question. It's hard to talk about this briefly. I've written a lot about how we moderate politics on HN, and some of it may make sense in this context. Examples: