Yesterday afternoon, the phrase #FireMeghanMcCain was trending on Twitter. What terrible, awful thing had she said to warrant trending on Twitter? The co-host of the View had done something few others have: decried an alarming spike in anti-Semitism. It’s not surprising, if you’re familiar with Twitter, to see how an outspoken defender of the Jewish people may find herself in its crosshairs. This is a place where variations of the phrase “Hitler was right” were posted more than 17,000 times (according to the Anti-Defamation League) in just a one-week span in May. As in-person violence against Jews has spiked, so...