Rabbi Oren Steinitz didn’t set out to get the nickname Rabbi Vax. It happened about a year ago, amid a measles outbreak, after he expressed his pro-vaccination stance on a local radio show. Asked if he would ban unvaccinated people from entering synagogues, the rabbi replied, that if it were up to him, absolutely. “Anti-vaxxers” from across the country sent the leader of Kol Ami synagogue in Elmira, New York, a slew of hate mail, claiming that vaccines are made from pigs and fetuses and that he was a “fake rabbi” who didn’t really know Judaism. He also received congratulatory ema...