I might have to side with the doctors on this. The hypocratic oath says first do no harm. By that definition, no living person should ever be allowed to donate an organ. The medical community has bent the rules a little in order to make money. Pure and simple. Transplants are a profit making venture. They know they are doing wrong so to assuage their guilt they draw a line somewhere else. That somewhere else is to not do transplants to people who are unhealthy so as not to waste an organ. Apparently they have decided genetic health is also a consideration.
You can do fine with one healthy kidney. If a parent is willing to donate their kidney to their child (for instance) there is no reason they should not be able to. Are you suggesting your body parts are not your own?
There's an exception to that rule for well know former baseball players. They get to go to the head of the line even if they have terminal diseases other than the self inflicted liver damage.
“That somewhere else is to not do transplants to people who are unhealthy so as not to waste an organ.”
The article never mentioned if the child was unhealthy or not. Where did you get this info?