They need to trust that users will decide what kind of content they want to see, using the voting algorithm central to this website.*
Moderators on Reddit are in my opinion unlike moderators in any other online forum they're more akin to visible participants in a subreddit than overseers. I believe that the key to being a good moderator can be summed up in one word, one idea: trust. Needless to say I'm also very active here.
There I learned how important good moderation is to the health of a community, and also the consequences of bad moderation (specifically, treating the community as a plaything rather than a group of real people). While I've never been a Reddit moderator, I was the super moderator of an amateur game development community back around 2006. G'day I'm /u/OnlyForF1, I'm a full time Software Engineer, and am based in Australia.