Israel is a de facto two-nation state which, for a long time, has included the Occupied Palestinian Territories. Half the state’s citizens are Jewish and half are Palestinian; there are around 6.3 million of each. The Jewish half is privileged and enjoys social and civil rights, whereas most of the Palestinian half is under occupation and has few or no rights at all. This is not the way a democracy should behave.
This is increasingly recognised by liberal Jews. Omri Boehm, for instance, wrote a piece in the New York Times saying that liberal Zionism is a contradiction: liberal American Jews have “identified themselves with Zionism, a political agenda rooted in the denial of liberal politics.”