I don't necessarily know that it's moderator malfeascence so much as people abusing HN tools to bury stories that they don't like, but I do think that there should be some consideration about how those tools are being abused and how that abuse can be effectively countered.
I get the impression that an effort is being made to correct the situation, but I've given up on the front page and only visit /active now, so I might be completely wrong.