I apologize in advance, SlimBoyFat, for de-railing this thread...but, the questions have been asked. And it would be rude not to answer. And besides, it still pertains to the information age explosion. What I am about to say wouldn't be possible without the sources to back it up.
OC, I always thought the blood ban came into full force in the early 1950's so what was Knorrs' motivation to think this dreadful doctrine up? did he just pluck it out of thin air? was it borrowed from another belief system?did he think about the repercussions for the R&F ? did he pay any attention to the destruction, death and damage it would do? they have a Jonestown tragedy many times over! did he just make it up because he could?.
The first mention of a blood transfusion ban came in July 1945, with one little hint of it in I believe, December 1944 - both mentioned in the WT magazine. I think I have those dates right - jwfacts has those dates.
When I first found that out, because most people don't realize when it became a prohibition along with me, I wanted to know why. Why would Knorr take a radically different stance on a procedure that had been implicitly approved in earlier literature and why then? Why would he ban blood transfusions when the rest of the world was making huge advances in that field?
So I took a look at where blood technology was during WW2. Doctrine is flexible (very flexible in the JWs) and can be manipulated in response to outside events. History is less flexible - some of it just gets covered up. So I read this book:
Blood: An Epic History of Medicine and Commerce by Douglas Starr - 2000
Starr gives a detailed account of blood history and examines each country's contribution to the advancement of blood technology. WW2 was responsible for many advances in the field of the medical use of blood - the US (Cohn) developed fractionization, the Russians used blood copiously (even employing cadavar blood) and the Japanese even tried horse blood. And the Canadians - it was a Canadian, in the Spanish Civil War, who developed the system that bloomed into blood banking.
There was only one country that lagged behind in their blood research. They went the other way when it came to blood transfusions. They didn't like them - for various reasons including ideologically. During the war, while everyone else was looking for ways to increase the use of life-saving blood transfusions, Germany was researching ways to reduce and eliminate the use of blood.
The Germans conducted their research in pursuit of clotting agents, and ways to reduce blood loss. At the same time, when they did resort to giving blood, they often didn't give enough. They misused the blood typing, based on erroneous interpetation of racial blood typing, which resulted in hemolytic reactions.
Knorr's roots were in Germany - he was related to the German Knorrs - the ones who owned all those food interests. Knorr Foods. Nathan Knorr was German.
The parameters of the German blood research during WW2 can be found in the pillars of today's blood management, a field of medicine that is heavily influenced by the Jehovah's Witnesses. Blood management follows the German ideology of WW2 blood research - small amounts of blood and given rarely, the use of clotting agents and minimal blood sampling.
So, to answer the question - did Knorr make it up because he could? Yes, he did. He could control a whole group of people's choices in blood use, thereby creating a convenient sample group for testing noblood technology. He had the power to do so and he did.