[sourcery]

It is necessary to distinguish between that which is morally required, that is which morally permitted, and that which is in one's rational self-interest. Helping those in need is not morally required. It is morally permissible. And it is in a person's rational self interest to show the same empathy for others, that one would like to experience from others. This can be seen by considering the principle of reciprocity, the power of cooperation, and the probable consequences of a complete lack of empathy or compassion in society.

[Pistias]

it is in a person's rational self interest to show the same empathy for others, that one would like to experience from others.

That no longer holds if one can be cruel without being seen for what one is--then it is one's rational self-interest to screw whatever poor sod's unfortunate enough to need one's help.

Helping those in need is not morally required

Things that are required incur a penalty--most often in the form of reprobation--if not done, correct? Do we not (justly) call a man cruel who gives no aid to a starving child or a person drowning in a river, especially when such aid is easily within his power?