"one bad apple can spoil the whole bunch" or one douchey moderator can "rot" the whole forum.
If one apple/moderator in a bunch/forum is indeed rotten/douchey, it emits gasses/vibes that can be absorbed by other apples/people in proximity, causing them to begin to rot/get ****ed as well. the phrase can also be used to describe negative after-effects. for example, if one moderator calls someone a liar and constantly over-moderates every conversation, it tends to make others not want to post and waste their time jumping through the thousands of hoops it takes to have a decent conversation.
it seems the people that control the forum prefer to have D-BAGS, overzealous christians, and spammers run the forum rather than grown people having a discussion or GOD FORBID! an argument on it.
the FP would probably be better off changing it's name to the "Bible Post" if it wants people to actually post again.