Not even Watchtower's top leadership is willing to stand in front of a learned audience and answer pointed questions about its blood taboo. The reason is simple enough: the whole thing is utterly indefensible.
This nonsense about "major" this and "minor" that is a perfect example. Today's Jehovah's Witnesses can and do accept a blood product known as cryo-poor plasma (also termed cryosupernatant). This blood product is 99% of plasma and comprises more than 50% of whole blood. Yet Jehovah's Witnesses accept transfusion of this blood product, and for one reason: Watchtower's blood policy does not forbid it under pain of its organized communal shunning program.
See: Over 96% Accept 99%!
Watchtower's blood doctrine is one of the biggest lies the organization has ever involved itself with. It has killed Jehovah's Witnesses by the thousands!
"It is estimated that approximately 1000 Jehovah’s Witnesses die annually worldwide and as many as 100,000 may have died by abstaining from blood transfusions since the blood ban was introduced in 1945."--Welsh, The Management of Adult Jehovah’s Witnesses in Anaesthesia and Critical Care, Australian Anaesthesia 2011, p. 125
See also: More than 50,000 dead