I will not sign an organ donor card, because I have personally talked with (in real life and on FR) those who have assisted some “harvesting”. To get a good heart, the heart must be removed before it stops beating. The preferred method of harvesting organs is to take it from a donor is still living.
Having said that, things like donating a kidney, which is done most often from a healthy donor who gives one, is a great act of charity.
That is monstrous. People who do things like that are psychopaths.