Earlier quoted context omitted.
Whatever its other faults, SCOTUS is usually pretty good about not letting crummy defendants blind them to setting good precedent. For example, Miranda warnings came about when they threw out the conviction of a man who had almost certainly kidnapped and raped a teenager.
Miranda v. Arizona was decided over 50 years ago. How relevant is the behavior of SCOTUS 50 years ago to predicting their present-day behavior? The membership is completely different, and there have been countless other changes in law and American society and culture over that period. (I'm not necessarily disagreeing with your point, which may well be right, but your example might not be the best example to demonstra…
Because the Supreme Court is an institution with an institutional culture. Furthermore, its members obsessively study it's past decisions and their reasoning, so I'd expect its culture to have quite a bit of inertia.