Israel has never, for example, genuinely addressed the fact that non-Jewish Arabs who generally identify as Palestinian account for about 20 percent of the population (this excludes the approximately three million Palestinians living under Israel’s control in East Jerusalem and the West Bank). Israel has also never clearly defined its borders, preferring to keep them vague and porous. Nor has it defined what it means to be “Israeli,” as distinct from being “Jewish,” leaving a vacuum that has been filled by nationalist and religious ideologues.

This has allowed the us-versus-them mentality to bleed into Israeli Jewish society. “Us” no longer refers to any Jewish citizen, and “them” to any Palestinian. Now, “us” means all those who defend the status quo of occupation and settlement expansion, including many Christian evangelicals and Republicans in America. And “them” means anyone who tries to challenge that status quo, whether a rabbi, a dissenting Israeli soldier or the president of the United States.

Perhaps this shouldn’t come as a shock. For most of Israel’s existence, the majority of Israelis have allowed the state, in the name of Jewish sovereignty and security, to violate Palestinians’ basic human rights — including access to water and the freedom of movement and assembly. The state has killed unarmed protesters and then failed to carry out investigations; it has allowed settlers and soldiers to act with impunity; and it has systematically discriminated against non-Jewish citizens. After so many years of repressing those who stand in the way, the transition to targeting “one of your own” isn’t so difficult. Now it is the few Jewish Israelis who speak the language of human rights who are branded as enemies.

Zeev Sternhell, a political scientist and an expert on fascism, believes that “radical nationalism” and the “erosion of Enlightenment values” have reached new heights in Israel. “To grieve for the loss of life on both sides is already a subversive act, treason,” he told Haaretz. Mr. Sternhell has experienced Jewish extremist violence firsthand; in 2008, a settler planted a bomb in his home that wounded him.

Israelis increasingly seem unwilling to listen to criticism, even when it comes from within their own family. Not only are they not willing to listen, they are trying to silence it before it can even be voiced. With a family like that, I would rather be considered one of “them.”

Mairav Zonszein, an Israeli-American writer, translator and editor, blogs at +972 Magazine.