I don't know why you say we would not need ethics or morals; just because I don't feel hurt, angry, or afraid when you steal from me does not mean you should steal from me. Ethics and morals are not about feeling and emotions but about providing traffic signals so we interact more smoothly.

Everyone can't fit in the same space at the same time and it's that knowledge that it is unethical to try to butt in front of someone in line, to run over someone to get in the store to get your Nike, "Air Jordans" that is the reason we teach our children our morals or, in school, business ethics, not that you might hurt someone's feelings?