As supreme court justice Oliver Wendell Holmes put it "law...expresses the beliefs and wishes of the dominant force of the community". I would add likewise with taxes. Fair has nothing to do with it beyond a marketing slogan.
But who/where/what is this "dominant force" of the community that wishes the current tax scheme would remain unchanged? I honestly don't know a single person who thinks the current tax scheme is fair, or that it expresses their wishes and beliefs. I admit that I only know a couple of business owners, but they express their extreme dissatisfaction at the current tax rate, and the current tax code (which is insanely complicated).