Then again, the United States is no democracy either so why should the US Supreme Court be held to the standard of a court of law?
The Republicans, including that thug in the White House, are utterly shameless when it comes to stacking the deck of justice. They pride themselves on perverting the highest court of the land by appointing reliable justices to advance their rightwing and corporatist agenda. And, by and large, the greater collective of idiots, also known as half of the American people seem just fine with the idea that their judicial system should be so profoundly corrupted.
In the States it's not just politics that is divided right and left. So too is the judiciary and the rule of law. Citizens United was a consummate expression of judicial corruption.
Justice, as revealed in the statue (above) of Themis in the Vancouver Law Courts, is supposed to be blind, serving the poor and the rich, conservative and liberal, without distinction or bias.
Kavanaugh was not nominated to fill Anthony Kennedy's curiously engineered retirement because he was an outstanding legal mind. He was chosen for his record as a Republican operative who would be politically reliable on the USSC bench.