As for the politics of SD....
Every one is right, it should stay out of the classes and only worried about between those involved. I think the problem is that someone will get a snipet of something that is going on and then fill in the blanks on their own. They then will go and tell others so it will appear that they are in the know for no other reason than their ego's. I couldn't count how many times something has happened (and I usually hear when it does) and someone comes to me or emails me with the details all screwed up. Its a shame but what can you do.
To any teachers that might be lurking, bringing any of the politics or any of the other bs in to the class will only lead to disaster, misinformation, and could eventually drive the students away. They are there to learn an art (yes, a real one) and nothing else.
I must admit, this forum thread has shown me some of the faults in SD that I was not aware of and many that I was. For any of the students that got a bad experience from SD or their teachers, I appologize. Some of the experiences that I have read about shock me. That is not the way Master Sin taught us to promote his system.