"Professional" and "profession" are inter-related and not two different entities as you suggest.

Let's say that what you have written is your very own perception of the world and not necessarily the norm that others should follow.

A professional is a professional because he has a profession, and is acting in a professional manner then.

Acting in a professional manner always includes knowledge, skills, competencies and to follow certain ethical standards, in some professions where you deal with people depending on you and in those where this is not the case. A professional race driver, for example, must follow an "implicit" ethical code not to hurt himself and others when driving his car and to refrain from drinking. There are other examples as well.

To assume that this does not apply to singers or race car drivers is just ridiculous.

Good luck in your ivory tower!