The Psychology of Human Desire

When our moral faculties developed in our evolutionary history we were living in small enough groups it would just make sense to develop a sense of empathy that extends as far as human interaction goes. I think there is a good evolutionary explanation if not a moral reason but a but a good motive a reason why I would have that desire even if I only care about my pleasure to care about that person because as a social creature I can't help but feel that empathy and the only way to remove that pain for someone else being being harmed is to help them.