I don't think she is vulnerable. It's about "control".
The way I see it (again, we all interpret it differently) is that she is the one in control. When you indulge in such things as light bondage or roleplay, you are always in control. The set up of the photograph is such that I interpret it as she is consenting to be held down for her own sexual pleasure, and also consenting to the men around her to be looking on. She has a look of arousal on her face, not one of fear or terror. Her facial expression alone could change this picture from one which is sensual/sexual to one which is nasty. The men also don't have menacing expressions or body language.
I understand why it was banned. If enough people interpret it as "gang rape" then obviously it sparks outrage. But, also, as has been already mentioned, any publicity is good publicity so D&G win either way.
When I look at the picture, it doesn't conjure up the words "abuse", "rape", "degrading" or "violence". I find it sexual and a bit kinky. It floats my boat.. maybe it's all about preference.
