It's one thing to choose for yourself to avoid using blood because there are health risks associated with it but it's another thing to used connect the dot scriptures to prove that using blood to save a life isn't allowable because it's against god's law and malign anyone who takes a transfusion.
There are risks in taking antibiotics and and certain other medications and simply checking into the hospital is a health risk in itself but when a person needs those things badly enough, the odds are usually worth the risk.
Just because there are health risks in using blood, doesn't mean the Watchtower Society was right about anything. Their stance was a biblical one rather than a health matter. Blood was abstained from because it was "sacred" not dangerous. Their religious stance just so happened to have an additional health related concern that worked in their favor.