Mods don't usually moderate outside their own forum. Plus, being a moderator does not turn you into an all knowing entity with no personal opinion.
I moderate Biology, but even there, James, Stryder and Plazma can decide that I let stuff slide and moderate what they consider I should have. Just because one moderator does not see anything wrong with the picture is no criteria for what the other moderators should think. Sometimes we argue over it, but ultimately, the more argument there is over moderation, the more moderation there will be. Its only natural that no one wants to be considered biased. So at the end of the day if someone thinks they have the right to insult members or be racist because they cannot comprehend the content of posts like those of Lounatic or gendanken or Satyr, guess what the end result will be?