Just a small note on organ transplants. In the same 1967 Watchtower article which described human organ transplants as cannibalistic, it also said :
At present scientific researchers are starting to use artificial or animal parts where formerly human parts were thought necessary, such as in the case of cornea transplants. ... Whether wider use of such operations will be made, we do not know. Nor can we decide whether a Christian should accept some animal part as a transplant; that is for personal decision. (Gal. 6:5)
So it would be true to say that "organ transplants have always been up to the individual". It is only the transplanting of human organs which it was thought that God did not permit.