I have in the past heaped all the blame on Dr. Nick, over the last few years however I have come to understand that there is a whole bigger issue around Elvis' prescribed meds. There were other Doctors across the US who were willing to give Elvis what ever he wanted. I don't disagree with the fact that Dr. Nick was star struck and probably felt honoured to be a part of the gang in the 70's. Dr. Nick probably thought he could control Elvis' addictions, but if others were prescribing meds it's hard to keep a handle on the situation.
We all have this vision of Doctors as being above reproach but they are human too with all the weakness' that go along with it. Dr. Nick is not totally responsible for Elvis' death, he is just part of the problem, how big will depend on who is deciding.