That would make four of nine, or 44% Jewish supreme court. It's quite remarkable considering Jews make up only 2.2% of U.S. population.
And you are correct concerning the threat to our second amendment right, but that's not all that's threatened. Elena Kagan, along with
the ADL, presents a huge threat to our first amendment right.
"Kagan is a First Amendment scholar who has written several law journal articles on the free-speech right. In “Private Speech, Public Purpose: The Role of Governmental Motive in First Amendment Doctrine,” she argued that the Supreme Court should focus on government’s motives—not the actual effect of a law—as “the most important factor” when deciding First Amendment cases. She conveys a tolerance for “redistribution of speech” when the government deems that the speech is based on “neutrally conceived harms.”
In another article, titled “Regulation of Hate Speech and Pornography After R.A.V,” she writes, “I take it as a given that we live in a society marred by racial and gender inequality, that certain forms of speech perpetuate and promote this inequality, and that the un-coerced disappearance of such speech would be cause for great elation.”
We have a clue as to what Kagan’s inclination to restrict speech means in practice. As U.S. Solicitor General she argued on behalf of the federal government in the recent Citizens United Supreme Court case, which addressed government’s right to restrict constitutional free speech during an election..."
http://humanevents.com/2010/05/16/who-gets-the-gag-elena-kagans-first-amendment-problem/
Read the whole article, she's scary.