No SCOTUS is not expert in bias. Very few judges are close to expert in the realms they judge. That's why you have "expert testimony" and its associated extra legal weight.
SCOTUS is ostensibly 'expert' in the Constitution and the law. But here you have a case where they said it was Constitutional, but then got 4 different interpretations of the law. No "expert" ruling supporting Ricci got more than 2 unique votes whereas DeStefano's position was upheld by a plurality of 4 votes. Hardly a "consistent" view from the "experts".
The general public that you don't think is competent to analyze this data is the same public that comprises the jury pool in the U.S. Here you are, a lawyer, implying that a jury of average Americans is INCOMPETENT to analyze the data presented to them in trials every day
Largely they are. Ever sat in on Jury deliberations? 12 Angry Men overstates the articulateness and rationality of the participants.
That's why NH did and would take this to a Judge, not a jury (their option). (and I'm not a lawyer, I just grew up with the law, find it fascinating, and one of my sons is on his way to becoming an atty).
One thing I've learned in my career is that hte "average guy on the street" makes rather poor decisions, but the diversity of beliefs essentially offsets the irrationality.
A misanthrope doesn't like people. I genuinely like people. I just don't have a lot of respect for their ability to reason. Most of their decisions are not reasoned, but emoted simply because they lack the skills (and sometimes ability) and interest to actually reason.