If the Society was dealing with this issue for the first time right now..........I'm sure they would handle it very differently than when it was in the 1940's (or whenever the doctrine started)
Now they're stuck with this.......the repurcussions would be far too great to back off completely now. But they are trying..........(ex. - the acceptance of blood fractions)
They're likely hoping that eventually medicine will develop a synthetic blood product.