This month, Elon Musk threatened to sue the Anti-Defamation League, alleging that its denunciation of X"the A.D.L. had accused the social-media platform formerly known as Twitter of amplifying antisemitism"has cost Musk's company a fortune in advertising revenue. The Anti-Defamation League, in turn, asserted that Musk's threat was "dangerous and deeply irresponsible." This week, Israeli Prime Minister Benjamin Netanyahu flew to California to meet with Musk to discuss artificial intelligence, but their other much-anticipated topic was antisemitism. Netanyahu asked Musk to "stop antisemitism as best you can." Musk, alluding to SpaceX and his hope for a mission to Mars, responded that he favors anything that "ultimately leads us to become a spacefaring civilization," and, since hate hinders that mission, "obviously, I'm against antisemitism."