People routinely jump to conclusions like this from the small number of data points they happen to see. Specifically, when they see something they dislike, they place a far greater weight on it, and are more likely to notice it in the first place [1]. This leads to false feelings of generality [2] and basically guarantees that everyone with passionate feelings (i.e. strong dislikes) feels like the mods are against them [3]. This is all false—it's powered by cognitive bias, which is why users with opposite passions notice opposite things and feel like the moderation goes against them.
Consistency is a red herring, not because we secretly side with one view, but because it's impossible. We can't moderate what we don't see, and we don't come close to seeing everything. If you see a post that ought to have been moderated but hasn't been, the likeliest explanation is that we didn't see it [4]. You can help by flagging it or emailing us at hn@ycombinator.com.