As New York’s annual parade in support of Israel worked its way down Fifth Avenue on Sunday, a group of Israeli citizens shouted from the sidelines. They waved signs demanding a ceasefire in Gaza and the release of the Israelis held by Hamas. They chanted “shame” as two rightwing Israeli cabinet ministers, who have defended the killing of thousands of Palestinians civilians, passed by. Above all, the protesters sought to challenge those Americans who regard support for the war in Gaza as a litmus test of loyalty to Israel. “Some people booed us because they saw the word ‘ceasefire’ even...