For the past several days, Elon Musk has been engaging in a very strange feud with a leading Jewish anti-hate group. In a series of posts on X (the site formerly known as Twitter), Musk repeatedly blamed the Anti-Defamation League (ADL) for a 60 percent decline in the site’s revenue — alleging a coordinated effort by the group, which monitors extremism, to push advertisers away from Twitter after Musk purchased it last year. “Since the acquisition, The ADL has been trying to kill this platform by falsely accusing it & me of being anti-Semitic,” Musk wrote. “To clear our platform’s...