Could you find out if they do that to all ferals that are surrendered to them? And if so, could you also contact the trustees of that estate that made the endowment and let them know about their practices? If they have 3million in holdings to help keep the shelter running, and they want to keep the money from an endowment, they might want to give a little more time to ferals.

The one shelter I volunteer for has ferals in it. Many have been there for years. Not saying that you want any cat in a shelter for it's entire life, but they are safe from harm and have food, water and shelter.