Sometimes, Cofty... some people need to see it according to Christ. Because Christ is the one they are looking AT.
So a person can reason about the law all day long... and that helps people too, no doubt about it. But for some that is not enough. For some there is still hesitation. Because they know (and maybe they don't even realize that they know this truth) that it is to CHRIST that one must look to know Truth.
So if some of these can see that Christ did this giving of blood... even a blood transfusion in a more advanced and spiritual sense... then they can not only be see that it is okay, but their hesitation will be gone because they have seen it in the Truth, Himself.
Peace,
tammy