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I noticed this happens to a greater extent the further the post is about tech. For example, opinions about the Damore memo got over a thousand upvotes, but disappeared off the front page in a few hours.

I'd beware of drawing general conclusions about HN or HN moderation from examples that stand out to you. Which particular examples stand out are going to be highly conditioned by what you're already interested in and/or feel strongly about. (I don't mean you personally, but everyone.) That tends to lead to erroneous conclusions—and people who feel the opposite way derive the opposite erroneous conclusions.

Based on how we work as moderators, I'd say it happens to a lesser extent the further the post is about tech—but that's not really what we're looking for either way. What we're looking for is topics that are intellectually interesting and can support intellectually curious discussion. Topics that have already been debated to death are much more likely to get penalized whether they're about tech or not. Initial discussions about the Damore thing spent much time on HN's front page, just like the Snowden thing in 2013, and the Stallman thing a few years later.

Why do we tend to penalize topics that have already been debated to death, unless a story contains significant new information? Because curiosity withers under repetition and people's responses become predictable. In other words, moderating this way is a simple consequence of intellectual curiosity being HN's organizing principle. That's the one thing we optimize for in everything we do here.

Even with all that, I'd say we barely get by in terms of having an intellectually curious site—but there are so many strong forces acting against it, that barely getting by is probably the best one can do. From the beginning, the idea of HN has been to stave off decline for as long as possible. I've always liked that goal, as it seems modest enough to have a chance.