This idea there is some "silent majority" of pro-tracking and pro-ad HN users doesn't track with reality. Everyone on HN can uovote and votes are how voices get magnified. If that was the case we'd expect the odd pro-ad/tracking comment to always be near the top of the comments section.
The reality is this is adverse selection: those users probably weren't interested in a post about updates to GA, and didn't click it.