Sowhatnow. FWIW I personally know a man who as a teen was accidentally shot in his mammary artery. The ER desperately tried to save his life with blood, since most had been lost by then and his chances were extremely low. His mother had been prepared that he was likely going to die. Not only did he survive, but he has no lasting effects of such a blood loss. He is now a successful, happy member of society with a wife and children. So, being " that messed up" to need blood to survive is such a matter of circumstance that the blanket comment you made is not logical in relation to life after the procedure.
The reasoning for a JW to refuse blood should completely and strictly be in relation to the bible, ( which require massive, WT dictated, mental gymnastics) not health reasons and to avoid risks; not emotional reasons, strictly biblical is the only reason. Yet, the WT continually brings in health, risk, emotions, etc etc and now allowing fractions, which is completely absurd to the entire "biblical" reasoning.
** to add, I want to compliment leaving_quietly below for such a easy to understand, logical reasoning of the biblical instruction of mercy.