Well for myself there is a great deal that I consider to be light bdsm and not in the extreme of things. Yet for many people my idea of extreme is to some way to freaking extreme depending on who you talk with etc.
Everyone has their point of view when watching things happen at a play party or even on film. I have seen many things that make me sick because to me they are that way, yet I have also seen things that make me go hmmm I wonder.
To me as long as all parties involved enjoy what is happening and that no lasting damage or harm is dun that that is what matters the most, its when the lines are crossed and nothing is dun about it that to me that is just sick and wrong.