To his credit, Jonathan Freedland denounces the anti-Semitism manifest at European protests against Operation Cast Lead. The Guardian columnist points out that after 9/11 and 7/7, the same people were urging the world not to make those kinds of generalizations about Muslims.
Besides, this business of distinguishing between good and bad Jews has a long history. Anthony Julius, author of a definitive study of English antisemitism, says that, with the exception of the Nazis, Jew-haters have always made distinctions. Christian antisemites accepted Jews who were ready to convert and rejected those who refused. A century ago, Winston Churchill drew a line between homegrown British Jews and those spreading Bolshevism. Now the dividing line is affinity for Israel.
But the logical corollary of this is that, if Jews refuse to dissociate themselves from Israel, then they are fair game for abuse and attack until they publicly recant. Liberals rightly recoil from the constant pressure on Muslims to explain themselves and denounce jihadism or even islamism. Yet they make the same implicit demand when they suggest Jews are OK, unless they are Zionists. The effect is to make Jews' place in British society contingent on their distance from their fellow Jews, in this case, Israelis.