@ Rowan - at least in part thats true - but more generallly, in severe trauma cases, something needed to be done to aid in maintaining plasma volume.
Personal anecdote. Many years ago, we had a jumper from a multistorey car park in the town near the hospital where I was working. Whilst the various surgical teams did what they could in an effort to save the young mans life, we had to support their blood transfusion needs. We went through 70 units of blood in around 5 hours - That meant returning all blood earmarked for patients on the elective surgery lists, cancelling all prebooked elective surgery lists, getting additional stock from the regional blood centre, and using all our own stock of uncrossmatched blood- all for one patient, all in the space of 3 hours, and all , in the end, for nothing. Had there been no use of cell salvage or autologous blood transfusion practice, the final tally of units would have been very much higher.
You cannot possibly hope to treat such badly damaged patients with anything other than blood if you have any hope of keeping them alive. I guess in such circumstances, the JW approach would be to shrug their shoulders, look up to heaven and proclaim that its Gods will.