According to Jewish teaching, if your birth mother is Jewish, then you born a Jew and will remain a Jew until the day you die. That even includes if you renounce the religion of Judiasm and/or declare yourself an atheist. (which none of the SCOTUS judges have done, BTW).
If you disagree with that definition of "Jew", you are free to take it up with leading rabbis and try and convince them otherwise. Until you do so, the SCOTUS members will continue to be recognized as "Jews" by the Jewish community. You personally rejecting them won't change that.
Incidentally, polls have continually shown the vast majority of American Jews share their leftist ideology, so if being a socialist makes one "not a Jew" in your eyes, there would be virtually no "Jews" in the world today. Politically right-wing Jews are a tiny minority within a tiny minority.
Change the word Jew to Bolshevik and then you will have it right.
So if a man with a Jewish mother declares himself a Presbyterian, is he still a Jew?