When we find ourselves in positions whereby we can help people we should not hesitate to render assistance. There's nothing wrong with donating an organ in order to save a life. In fact it is an act of kindness and God will be delighted with such act. Life is very important.
Someone may have a great destiny ahead of him but when a health challenge sets in this may serve as a form of hindrance for such person in terms of fulfilling destiny. It's quite a shame that a good a large percentage of people that end up in the grave left this earth without fulfilling their God given purpose that they were sent to here to do.
Donating of organs was never condemned in the Bible. Even if the person that we are donating an organ to in order to save his life is a bad person by doing so you may be giving the person a second chance to live life in a different manner and also to come into reconciliation with Jesus Christ.
We should come to the point that we see every life as something that is precious and in any way we can ensure that that life is not cut short.