It becomes logical to ask where the idea originates that the rules of the game of life ought to be such that those who are weak, disabled or ill should be helped?
One answer is obvious: this is the game typically played in childhood. Every one of us was, at one time, a weak and helpless child, cared for by adults: without such help we would not have survived and become adults.
Another, almost equally obvious answer is that the prescription of a help-giving attitude toward the weak is embodied in the dominant religions of Western man.
Judaism, and especially Christianity, teach these rules by means of parable and prohibition, example and exhortation, and by every other means available to their representatives.

Chapter 10: The Ethics of Helplessness and Helpfulness. - The Myth of Mental Illness: Foundations of a Theory of Personal Conduct (1974)