President Donald Trump on Wednesday vowed to “crush the monstrous evil of anti-Semitism” as he signed an executive order giving the federal government more tools to defend Jews from anti-Semitism through civil rights laws protecting against discrimation on college campuses. The move is a welcome step to define the problem and empower the government to investigate such threats on campus, but American Jews are facing increasing intimidation and peril that go well beyond the university quad. What we are seeing today is the mainstreaming and normalizing of anti-Semitic tropes by elected leaders and media personalities that then empower bigots. One...