I know that this topic has been discussed at great length many times before but I would like to share with you my experiences with JWs that knock on my door when I have presented them with this hypothetical situation.
"Just suppose that you have two children, one has haemophilia and is being treated with factor V111 which is derived from blood and permissable according to the WTBTS as an act of conscience, taken and stored from a worldly person possibly even an apostate, permissable because it is a small fraction even though it takes litres of blood to extract this factor V111. You also have another child that because of an accident is in danger of bleeding to death and needs oxygen carrying red blood cells to buy this child time until the bleeding has been brought under control the blood comes from the same source and also stored, but is not permissable by the WTBTS would your conscience tell you to let this second child die"
# 1 JW Frantically starts seaching through their little black bag "Oh I am sure I have an answer to this in here, Oh well, maybe I came without it" says to # 2 JW "do you have it by any chance"
# 2 JW goes through the same procedure and says "No I don't believe I have, but you do have a point I will get back to you".
Or ......
# 3 JW "Nobody has put it quite like that before I will get back to you on that one".
Or......
# 4 JW " We have an HLC member in our congregation he will be able to answer you I will have a word with him and get back to you". A couple of weeks later they come back and tell me the HLC brother is too busy with all his other duties as an elder and family man to devote his time to this but they have noted my concerns and will get back to me.
Or......
# 5 JW "Well I here what you say, but why can't you just put this issue to one side and concentrate on the positive things in the organisation".
Still waiting for that answer!