The left, meanwhile, correctly decries such anti-Semitic overtones on the Trumpist right, even as it tolerates with equanimity the toxic environment that exists for many Jews on university campuses. It finds Ilhan Omar’s suggestions of Jewish dual loyalty, if not quite acceptable, then at least not worth talking much about. And many on the left seemed to not mind the U.K. Labour Party’s atmosphere of anti-Semitism—at least not until Labour lost big—though one poll suggested that nearly half of British Jews might leave the country if Jeremy Corbyn were elected, and another poll found that 86 percent of British Jews thought he was anti-Semitic.

So selective is our reaction to anti-Semitism these days that it is now commonplace in Jewish argument to respond to the suggestion of anti-Semitism on one’s own side of the political spectrum by saying, “Yes, but the real problem is not [whatever person or group just got mentioned] but [some example of anti-Semitism on the other side].”

If you catch yourself saying sentences like this, query whether your real concern is anti-Semitism itself, or whether you’re primarily interested in weaponizing the anti-Semitism of your opponents for political gain.