Evolutionary need of humans, whatever is felt helpful to progress and survive. There is no ABSOLUTE good or evil. What is good to one is evil for others, what is good now, was evil in past or will be in future.
Darkness cannot drive out darkness; only light can do that. Hate cannot drive out hate; only love can do that. ... The time is always right to do what is right.
Mirror neurons. Evolution is God's creative process. Once mirror neurons emerged, empathy became possible. No mirror neurons, no empathy. No empathy, no good.