Arguably it shouldn't be on the front page at all, since https://news.ycombinator.com/item?id=10337299 is, and that's the thread the HN discussion crystallized around. Edit: and then there's https://news.ycombinator.com/item?id=10338904. But I think that on the day the story broke, a few different angles are ok.
(p.s. I only saw this by accident. If you want to make sure that we see something, please email hn@ycombinator.com. We can't read all the HN comments but we do read all the emails.)
But that's not how HN moderation works. In reality it's probabilistic: all we do all day is guess. There's no hope of reading every story closely and making precise calls. Not even close!
If you'd do what other users (including other users who feel strongly about mass surveillance) do—consider the tradeoffs and help clarify which stories are best by HN's standards—you'll get better results than accusing us of sinister silencing.