If you ignore the fact that they are poeple and have every right to a happy life and view it in pure cold logic, then you might be inclined to think that abandoning them is good for society as a whole, but you would be wrong. With the aid of modern science, and a little understanding and patience, there are very few disabilities that can't be overcome, resulting in a productive member of society. Spending time with, and helping disabled people is also good for the "soul". They have a unique outlook on life, talking to and helping them gives you such a profound sense of satisfaction with life. How we treat the less fortunate says EVERYTHING about who we are as people.