Yeah, I think its a bit of sly trick from HN admins - they get to plausibly deny suppressing hot button topics because their intervention is to white-list discussion instead of having to be up front and make the tough decision to black-list them.

When a negative story about YC emerges and generates a lot of comments so it gets pushed off the front-page and they just say "shame but its just automatic flamewar detector, <shrug>". I'm sure they think they are clever but it just erodes trust over the long term.