“Opinion-writer politesse would require me to say or imply that the decay in the courts standing was the fault of “both sides,” or of both “right and left.”
But I cannot. It simply is not true.
One party made the Supreme Court a partisan issue. First Richard Nixon then Ronald Reagan made attacks the Court part of Republican Party dogma.”
And one man in particular saw to it to seal the partisan divide for a long time. You can die proud Mitch. So go ahead
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Requiem for the Supreme Court — The Atlantic

Through the 20th century, the court stood as an independent arbiter of the rule of law. It is a unifying, national institution no longer.