Amb. David Roet, Israel’s Deputy Permanent Representative to the UN, addresses the UN Security Council. Photo: UN photo/Paulo Filgueiras.

JNS.org — My father, Haim Hendrick Roet, a Holocaust survivor from the Netherlands, addressed the United Nations General Assembly in January during its annual Holocaust memorial ceremony, with this poignant cri de coeur: “Looking back 70 years, it is heartbreaking that as a world, we did not learn enough from the Holocaust.”

Eight months later, speaking from the same UN podium, Iranian President Hassan Rouhani embodied all that my father had decried, as he demonstrated once again that Iran has failed to learn from the past.

“Zionist pressure groups,” Rouhani claimed, have contaminated US Congress, “forcing the highest American judicial institution to violate peremptory norms of international law.”

The spectacle of an Iranian leader spewing centuries-old canards about Jewish control over foreign governments, financial institutions and the media is hardly new. Antisemitism is, after all, the most durable and pliable of all conspiracy theories known to humankind.

What’s deeply disappointing and dangerous, however, is the utter passivity and lack of condemnation that followed this statement. A few years ago, dozens of UN delegations took a principled stand against blatant Iranian antisemitism and walked out in protest when former Iranian president, Mahmoud Ahmadinejad used the same forum to raise similar hateful accusations.

So, where’s the outrage now?

While many in the UN laud the Iran nuclear agreement, lift sanctions on the world’s leading state sponsor of terrorism, reward the mullahs with billions of dollars and lucrative trade deals, and welcome the current Iranian president as a so-called “reformer,”  official Iranian antisemitic statements and Holocaust denial continues unabated and unchallenged.

Meanwhile, the scourge of antisemitism, which not long ago many of us considered to be a thing of the past, has metastasized into a global social disease.

In too many places, Jews are again afraid to express their Judaism and be identified outside their homes and communities. Whether it’s in Brussels, where a man with a Kalashnikov opened fire and murdered four people at the Jewish Museum of Belgium, or over the Internet, where unimaginable hate is spread through cyberspace at nanosecond speed, on university campuses or even in the halls of the United Nations, we must take a stand against what one UN secretary-general called “the oldest living hatred.”

Antisemitism does not need a reason, only an excuse.

In the Middle Ages, Jews were hated for their religion. In the 19th and 20th centuries, they were hated for their race. Now they are hated for their nation. Acclaimed British philosopher Rabbi Jonathan Sacks writes, “The new antisemitism can always say it is not the old antisemitism.” Nevertheless, it remains, Sacks says, “essentially eliminationist.”

Whether in its old or new incarnation, antisemitism does not exist because of what Jews do, say or believe, or because of what the state of Israel does.

We must adopt a zero-tolerance policy to any sign of antisemitism or to any effort to excuse or rationalize it. New haters have been using technology and social media to disseminate their contemptible ideology. To confront them, the international community should agree on a clear definition of antisemitism so we can use advanced technology to stop online hate, while, at the same time, carefully preserve the important freedoms of speech and expression that we, as democracies, hold dear.

A few weeks before the Iranian president’s vile statements, the UN held an historic high-level forum on global antisemitism. Bringing the issue front and center at the UN is, regrettably, still fraught with roadblocks. Indeed, the forum was a result of the joint efforts of the UN missions of Canada, the European Union, Israel and the United States, not the UN itself.

Unfortunately, there are those in the UN who fear that speaking out and working together to confront antisemitism is “too political” or risks antagonizing a certain group of countries — so they stay on the sidelines.

A recent study found that one quarter of the world’s population harbors antisemitic beliefs. If the UN is a mirror of the world, reflecting all that is good and bad, the rising plague of antisemitism requires a UN that leads the efforts to eradicate the resurgence of the world’s oldest hatred without excuses and fear.

The UN should not lead the fight against antisemitism in order to appease Israel. As former secretary-general Kofi Annan declared, it should be done for the sake of all nations and all people. “A human rights agenda that fails to address antisemitism denies its own history,” Annan said. “The Secretariat must be vigilant…The fight against antisemitism must be our fight.”

It’s imperative for the UN to fight antisemitism with the same urgency it places on combating the other ills of the world.

As secretary-general Ban Ki-moon rightly reminds us, “A United Nations that wants to be true to its founding aims and ideals has a duty to speak out against antisemitism.”

Ambassador David Roet is Israel’s Deputy Permanent Representative to the United Nations.