Lets assume that certain personality traits, such as Orderliness, Compassion, and Politeness, are most conducive with the role of moderator and they are the most susceptible to feeling (perhaps very intensely) disgust when confronted with such content (especially repeatedly over a long period of time).
It may be a catch-22. We theoretically want orderly, compassionate, and polite people moderating the public discourse. If we filter out those personalities, leaving only the most Open people who are least likely to have disgust sensitivity, then we have the people who are the least capable of making important distinctions about what is acceptable to the rest of the us.
That said, perhaps that's exactly what we need, instead of having moderators making sophisticated distinctions, we just need moderators who are capable of and willing to identify what is (universally) criminal/evil (exposing them to the worst of humanity). Leave the remaining distinctions to the community.
[0] https://www.sciencedirect.com/science/article/abs/pii/S01918...