I can see how people think that and that is an honest way to look at it. But there are organizations and hospitals striving to reduce blood transfusions for a number of reasons. In the US there is an organization that is the leader in this.
It should be a personal decision, some people who aren't JWs don't want blood transfusions which is their right as well. But all hospitals are striving to reduce blood transfusions not just for patient outcomes but also for economic reasons. I agree with many people here, that it should not be forced upon anyone to refuse a blood transfusion, but it should be a personal decision.
Just like there are some Catholics who believe in abortions while the official policy is that abortions is a mortal sin. It should not be forced upon people to choose one way or the other.
But if you are saying that JWs are the only people that risk people's lives with their interpretation of medical procedures you have to look at other religions too. I am not talking about Christian Scientists. But look at Catholics and Catholic Hospitals, where it is the policy of the hospital not to perform abortions under any circumstances. There have been plenty of instances where a mother has needed an emergency abortion in order to save her life, but the hospital that she is at won't perform the procedure because of their religious beliefs.