One thing that makes a good moderator--in addition to all the things Pammy says--is the aim is to moderate forum behavior toward what FindersKeepers says, that is, not to get rid of members but to help point them in the direction of good and expected behavior. Note that that's behavior, or attitude, or approach to posting and discussing political ideas and opinions: You are free to express your ideas and opinions just so long as you do so in a minimally reasonable way by following simple rules.
The odd thing is that this should ever have to be explained to anyone.