They don't understand how unbelievably dangerous it is to conflate criticism of Israel with genuine anti-Semitism.
What it does is it turns left-wingers who legitimately criticize and oppose the state of Israel who should ostensibly be allies of convenience (lol) against genuine anti-Semites (who tend to be murderous right-wing lunatics) into political pariahs, the same as genuine anti-Semites. This in turn pushes these mutual pariahs into each others' arms as strange bedfellows. You can literally see this phenomenon in action with hardline Marxist-Leninists giving "critical support" for Islamic fundamentalists who have become (due to the direct action of Israel and the United States among others) the only game in town when it comes to anti-imperialism, such as Hamas, Hezbollah, Iran, and the AnsarAllah rebels in Yemen. It's pretty undeniable that all of these organizations are rife with genuine anti-Semitism that inextricably intertwined with their opposition to Israel.
You also see this phenomenon in action in different historical contexts, by which I mean phenomenon of how political pariahs on both the extreme right and left becoming strange bedfellows in opposition to the center.
In the twilight of the Weimar Republic, an anti-republic majority became entrenched in the Reichstag, consisting of Communists and Nazis. Their mutual hostility to the functioning of the republic and mutual desire to see it destroyed led to the republic being essentially ungovernable except by presidential appointment and decree. These two parties were extremely bitter and irreconcilable enemies and yet they were thrust into conditions where they had a mutual interest in seeing the republic destroyed. The result was eventually Nazi triumph through a backstairs coup orchestrated by the mainstream conservatives.
The post-WWI world order constructed by the Treaty of Versailles was only established due to the virtual disappearance of the Russian and German Empires as major powers on the world stage, and its continued existence was predicated on those empires never re-emerging and seeking to reclaim their status as major world power. Inevitably, of course, both did, in different forms. Due to their respective ideological systems, Nazi Germany and the USSR were both pariah states under the Versailles order. Because the British had no interest in actually allying with the USSR against Nazi Germany and preferred to instead continuously appease Nazi Germany to avoid a general European war while playing games with the Soviets and stringing them on indefinitely, this ultimately led to a converging ,mutually beneficial interest between Nazi Germany and the USSR, especially as Soviet security concerns in both Europe and Asia continued to escalate. The result was the Molotov-Ribbentrop Pact, the partition of eastern Europe, and the precipitation of World War II.
They don't understand how unbelievably dangerous it is to conflate criticism of Israel with genuine anti-Semitism.
What it does is it turns left-wingers who legitimately criticize and oppose the state of Israel who should ostensibly be allies of convenience (lol) against genuine anti-Semites (who tend to be murderous right-wing lunatics) into political pariahs, the same as genuine anti-Semites. This in turn pushes these mutual pariahs into each others' arms as strange bedfellows. You can literally see this phenomenon in action with hardline Marxist-Leninists giving "critical support" for Islamic fundamentalists who have become (due to the direct action of Israel and the United States among others) the only game in town when it comes to anti-imperialism, such as Hamas, Hezbollah, Iran, and the AnsarAllah rebels in Yemen. It's pretty undeniable that all of these organizations are rife with genuine anti-Semitism that inextricably intertwined with their opposition to Israel.
You also see this phenomenon in action in different historical contexts, by which I mean phenomenon of how political pariahs on both the extreme right and left becoming strange bedfellows in opposition to the center.
In the twilight of the Weimar Republic, an anti-republic majority became entrenched in the Reichstag, consisting of Communists and Nazis. Their mutual hostility to the functioning of the republic and mutual desire to see it destroyed led to the republic being essentially ungovernable except by presidential appointment and decree. These two parties were extremely bitter and irreconcilable enemies and yet they were thrust into conditions where they had a mutual interest in seeing the republic destroyed. The result was eventually Nazi triumph through a backstairs coup orchestrated by the mainstream conservatives.
The post-WWI world order constructed by the Treaty of Versailles was only established due to the virtual disappearance of the Russian and German Empires as major powers on the world stage, and its continued existence was predicated on those empires never re-emerging and seeking to reclaim their status as major world power. Inevitably, of course, both did, in different forms. Due to their respective ideological systems, Nazi Germany and the USSR were both pariah states under the Versailles order. Because the British had no interest in actually allying with the USSR against Nazi Germany and preferred to instead continuously appease Nazi Germany to avoid a general European war while playing games with the Soviets and stringing them on indefinitely, this ultimately led to a converging ,mutually beneficial interest between Nazi Germany and the USSR, especially as Soviet security concerns in both Europe and Asia continued to escalate. The result was the Molotov-Ribbentrop Pact, the partition of eastern Europe, and the precipitation of World War II.