That's completely wrong. First, every court of appeal can strike down a law as unconstitutional. The Supreme Court is only special in that there is no further

That's completely wrong. First, every court of appeal can strike down a law as unconstitutional. The Supreme Court is only special in that there is no further appeal. Second, case law absolutely determines the interpretation of each text, and each court is mildly bound by its own precendent (via stare decisis), and completely bound by the precedent of superior courts. Third, there is no tension between these facts and people being judged individually and being equal before the law. The law must (in principle) be applied equally to everyone.