It’s not the doctor’s job to make a decision on how to treat a patient based on his moral worth. It would be a gross violation of the hippocratic oath to do so...
This is why I won’t sign a transplant form unless I have veto power over the recipient.
In Pittsburgh, the transplant team broke their own rules to give a liver to a homosexual activist with AIDS. The man made himself famous for breaking into Mass at St. Patrick’s and throwing condoms on the parishioners. By rule, livers aren’t supposed to go to people with terminal illnesses or over a certain age. He was both.