Ethical standards create a basis for acting out of a set of established boundaries. This way people could easily act inappropriately by gradually convincing themselves that they really haven't done anything too wrong. When there are ethical standards it is much easier to determine what is right and what is wrong. Along with professional ethical standards, we as Christians have a whole Bible full of standards for Christian living. These support the same concept.
Biblical standards provide boundaries which provide structure and stability in our lives.
Living by them becomes a witness to who we are. Ethical standards do not need to be found only in the context of a professional field, but can be applied to our personal responsibilities as individuals.