I had an encounter with a Jehova's witness at my doorstep. I challenged them on blood transfusions. Later I looked at JW website too. I am certainly agreeable on some of their rationale to avoid blood transfusion and ways of doing it as mentioned in their web site. But the basic fact remains that in some severely life threatening conditions and in situations where saving a life depends on ONLY having acute blood transfusions, following their doctrine means basically killing people. These conditions are profuse bleeding following severe trauma, leaking/ruptured aortic aneurysm, severe post partum heamorrhage, severe GI bleeds and in not so acute conditions like acute leukemia, bone marrow failure syndrome and bone marrow suppression due to chemotherapy.
Unless and until JW do have answers to these critical conditions mean, that people have died and more will die due to following their doctrine which is basically 'killing people'. If you take 1000 patient who have blood transfusions, certainly about 900-950 patients may be able to be managed with out transfusions BUT there is a critical number in above and many more conditions where there is NO answer to blood transfusion as at present and according to JW, they should die! But why should they? Their is a web page in JW saying 'life worth living' but they themselves are killing innocents who can live.
Another argument they give is to say that having blood may cause disease etc which is a tiny number and they do not say that vast vast numbers of these patients live due to their transfusions. Such argument is basically hiding the truth.
ISIS terrorists are killing innocents openly due to radical interpretation of Koran while JW is killing people silently for a similar reason. Quotes they use such as "eating blood' is NO WAY could be interpreted as having blood transfusions when such techniques were not known to man 2000 yrs ago when bible was written.