To be completely honest. I think that's the stupidest thing I've heard all day.
Natural balance? So you think starving to death is better than being put to sleep? To me that's cruel. Letting an animal suffer because "it's natural" is not only terrible but stupid.
I'm sorry to be so forward and blunt, but I can't believe someone would have that kind of a view.
As for non-feeders. There are a lot of techniques to get non-feeders to eat and at a certain point if none of those techniques work, I personally would NOT just let the hatchling die of starvation. If it continues to refuse no matter what you do, then it's time for it to go to sleep and pass on. Suffering is not something anybody, animal or person should have to do until the end.
If given the choice when I get old or if I were to end up a vegatable with no quality of life. I hope that by the time I get old they allow medical "murders"., because I would rather be "euthanized" than drag on without being able to truly LIVE.
Why let something live if there is no quality of life? Or if you know it will die anyway but more slowly and painfully?