All prospective organ recipients have to be on the UK transplant list. Fitness is monitored my DH was suspended from the list several times because of health issues. After 5 years he was told he had only a 14% chance of receiving a suitable kidney. He was absolutely devastated and became very depressed this was when our son stepped in. Even then the process took nearly 2 years due again to other health issues and poor co ordination with the transplant team.
Both DH and DS were interviewed by a psychiatrist regarding DS willingness to donate his kidney, how both might cope if the transplant was unsuccessful. Family photographs had to be produced if he needed convincing after seeing them I would have been amazed as the love they share as father and son shines out.
Just prior to the transplant DS was given 2 options should his kidney after it had been removed prove to be unsuitable for his Dad. 1) He could give permission for it to go to another suitable recipient or 2) It could be binned. Yes binned! I remember him being very upset at that.
Everyone has the right to their own opinion I would just say that mine is be very grateful that you don't need a transplant For there but for the grace of god go you and I".