First of all, Jews make up 2.4% of the US. Second, Supreme Court justices are appointed, not elected. They are not meant to be representative of population demographics. That's the entire reason they aren't elected.
Maybe you should retake your high school civics and US Govt classes, it's pretty clear your susceptibility to Russian troll farms has eroded what little understanding of the way the government is meant to work and replaced it with an irrational fear of anything that doesn't walk, talk and look like you.