It's not just recently that the Supreme Court has been that way. They often have worked backward from the outcome they desired, it's how you get originalism and textualism as legal theories. The only thing that stops them from doing something as egregious as what you are saying is them trying to maintain the legitimacy of the Supreme Court. There is theoretically a line that the Supreme Court could cross in which state and federal governments would just say, "No, you've overstepped too far and we're not going to listen to that decision." The Supreme Court has no way to enforce its own decisions, it has to rely on other branches agreeing that its decisions are legitimate to enforce their decisions.