I think each individual witness is totally responsible for their actions. The "I was only following orders" excuse holds no moral, ethical (or legal?) value in any circumstance.
I hold my family totally responsible. They have chosen to completely shun me, to treat me as if do not exist, and I'm not even disfellowshipped. I have not had any contact with my sisters for 15 years. I tried so many times to reach out to them but I was rebuffed at every turn. A few years ago I just ruled a line under it and moved on.
I blame them for their intectual timidity and their lack of personal integrity. How they could treat a close family member like that is reprehensible. They may have been instructed to do this by the wts but they chose to personally enforce it.
I personally do not give a shit about them now. They are flawed human beings and deserve derision.