The logical extension of your argument is that five US Supreme Court justices could Constitutionally throw out the Constitution altogether (except for the section that establishes the US Supreme Court).
That, or course, is absurd. Obviously if the clear language of the Constitution and intent of the Founders conflicts with what SCOTUS rules, the Constitution, not SCOTUS, takes precedence. Otherwise the Founders would have simply set us up with a council of nine supreme rulers in the first place and not bothered with the rest of it.
It’s the system the founders set man. I don’t know what to say to you. You can object all you want to but in the end it all comes down to those nine justices. I can understand your frustration and even agree with 90% of your argument but it’s all a wash. Founders intent is not always absolute, They did intend for blacks to be slaves you know.