Judges in England, and other Commonwealth countries dress silly because it's traditional, and are neither elected nor political appointments the way they are in the US. Frankly, the American legal system seems custom made to produce partisan and corrupt judiciary and prosecution.
I think the Founders' view was that the judiciary should be free of politics - which is why Supreme Court judges are appointed for life - so that they wouldn't have to worry about being re-elected. Although it varies at the state and local level.
Theoretically, it's
supposed to be divorced from politics, but realistically, I don't see how it can be. Judges are human - they have opinions, emotions - and they can be just as tempted by bribery as anyone else might be.
That's the whole reason why there's always much concern and consternation over who the Supreme Court nominee is. Their politics and character
do matter, as would be the case for any politician.
Our legal system may be flawed; I know it comes under a lot of criticism. Sometimes judges' rulings infuriate and confuse people, not to mention the number of times people have been found guilty and sentenced only to be proved innocent years or decades later. I attribute such things to legal/judicial arrogance and the public buying into the idea that a "black robe" confers some sort of infallible wisdom.
If we looked at them more realistically, as human politicians - and treated them accordingly in media and public opinion, then I daresay we'd get much better service from our judicial branch of government.