I have mixed feelings about blood transfusions. Although I'm not attending meetings anymore, I feel that God's command has, somehow, saved quite many JW lifes, if only when people would, 30 years ago, get HIV infected blood and JWs were protected by their religious stand. Also, and this is not religious, blood trade is scandalous, since the raw product is procured for free from well intentioned people or bought cheap from the poor, and sold at high price, even when the sellers know full well that it is infected. A political scandal ravaged France about 20 years ago for this reason.
Now, one has to admit that the current stand of the WTS on this subject, that is accepting fractions, has little to do with religious integrity and more with legal, and therefore financial, interests.
In conclusion, I don't know.