almost all JWs I have ever encountered in my practice would not hesitate to accept fractions if deemed necessary by a physician. Yet NOT ONE would consider donating their own blood for the extraction of blood fractions. I have asked discreetly. It's just maddening.
I usually pose it this way?
If you came across a bag full of money that fell out of the back of a getaway car running from the scene of a robbery. Would it be okay to scoop it up and use it for yourself, even if you felt it was for a good cause. Most good JWs will say "of course not!". Then ask why. They will normally say because its dirty money gotten illegally. Then I ask "And just how is that any different than using blood fractions that were obtained in a way (through blood donation) the WTS considers immoral, and thus illegal from gods standpoint.
Axelspeed