The dirty little secret is that if a vital organ is still living then the person is still living. The ability to think or feel pain is irrelevant. If the person is truly dead then all of his organs have died also. Vital organs cannot be removed without committing murder. This may be harsh to those who need these organs but we cannot treat persons as merely objects to be used for our own benefit.
I don’t understand this issue. If a person is brain dead (no activity on monitors) and if life support mechanisms are withdrawn and the person would die, what is the problem? Loved ones make the decision to pull the plug every day. Can’t organs be harvested with minutes when the heart stops beating. I really don’t know.