Good questions, Path.
I believe that although we are all ultimately responsible for our own actions, the Society does share some of the responsibility for the actions of its adherents, due to the advice, suggestions and doctrines that are given out to the rank and file as "divine truth".
This is because the average Witness does not have a great deal of latitude for following one's conscience, if his conscience differs from the info given out by the WTS.
Also, the average person who was raised as a Witness by Witness parents does not have the same access to "outside" information. Thus, they can become, as Ray Franz described it, "victims of victims", not knowing any better, due to circumstances beyond their control. They did not have the same resources that those who joined the Society as adults did. Thus, although they must still bear responsibility for their actions, there are influnces unbeknown to them.