Elon Musk visited Israel Monday. He toured Kfar Aza, a kibbutz that Hamas attacked on Oct. 7, killing dozens, and was photographed alongside Israeli Prime Minister Benjamin Netanyahu. The two then recorded a conversation on X, the social media platform Musk owns, and where he has spread antisemitic conspiracy theories. Just this month, for example, Musk wrote, “You have just said the absolute truth” in response to a post that read: Jewish communities have been pushing the exact kind of dialectical hatred against whites that they claim to want people to stop using against them. I’m deeply disinterested in giving...