I believe they are to a degree. Some other people are as well but I believe the lower you go into the layers of authority, the least responsible. At least from an ethical perspective. It is obvious that they have legally covered their butts pretty well.
You can not put full blame on the parents or the deceased him or herself when you are under this kind of influence and in regards to the consequences of non compliance. When you are convinced you are in the truth and you've are given two choices...
1- Give your child a blood transfusions, which is not guaranteed to save his life (or so you believe) and with the chances of getting all this horrible deceases
2- Insist on an alternative that may technically have less chances of success (but you believe otherwise) + you get to keep the family + you get your ticket to paradise.
Provided the above was true, the choice is clear. I still have a friend who believes getting a blood transfusion may give him the chronic conditions the other person may have and don't know it yet (like diabetes)