You find me a law that is not rooted in a moral/ethical belief, and I'll consider buying into your point.

I still don't understand your distinction between ethics and morals. The two terms are often used interchangeably, and the only distinction I've heard is when it comes to an establishment, such as the workplace, with a defined code of conduct which in itself is based upon some moral intent, such as the Hippocratic oath for doctors, an ethical code of conduct that doctors swear to which may at times may disagree with their personal convictions, but nevertheless guides their behavior when wearing their professional hat.

Look, even the laws that provide protection for minority-held beliefs stem from the moral concept that a majority should not impose its moral viewpoint on a minority.