Arrrggghh!! But we have to remind jw's that this isn't a medical issue. It is a biblical one. A jw must agree with you on this point. If the Watchtower bible says a fraction/component is not ok to accept(which it doesn't), there should be no "medical" breakdown of what percentage is allowed. If a particular component is banned, there is no leeway on the matter. Accepting just a little bit of it is still breaking the Watchtower's bible's command to abstain from blood.
The biggest problem the WTS has right now is separating the medical issues from the biblical ones. They obviously cannot follow the bible to the letter or else they would fall back to the 1950's prohibitions. So what do they do now? They cloud the blood issue with "medical advancements." I think this is why so many jw's are conflicted with choosing what treatment they should go with. On one hand, they have been used to hearing "NO BLOOD" for their entire life, but on the other hand, the WTS is saying medical treatments have advanced to where it is now allowable to accept a wide range of "non-blood" alternatives - which is blatantly false. Their idea of "non-blood" alternatives is anything other than 100% whole blood. It's confusing as hell to the jw's to pick what their conscience allows. Your average jw is more worried about his standing in the hall if he happens to take the wrong item in surgery - not to mention... "Will Jehover kill me at armageddon for taking this fraction since it is derived from stored blood???"
I honestly think the blood doctrine will eventually be a huge catalyst in the future in getting more people to leave. If the WTS ever makes it all a "conscience issue," they will be screwed. They are getting damn close as it is now.