Caution some may find the following disturbing.
Original Time Lightbox photo essay with updated edit: Photographer as Witness: A Portrait of Domestic Violence - LightBox
Opinion piece on the Time Lightbox photo essay: Domestic Violence Photo Essay Leads to Backlash Against Photographer
Most of the times a photographer should be a witness to what happens and a participant only when there is no other option or are trained to deescalate the situation and/or are capable of doing such. There are many variables to that statement also. How we would act or react to any given situation is sheer speculation until we ourselves are in the same situation. Curious to how other feel.