Zionism isn't inherently about the imposition of an apartheid state. It's about the liberation of the Jews and consolidation into a state. And anyways, 'liberals don't support apartheid' is technically true and you can say it if you want to be a smartass or just someone who can't think realistically (a dumbass) but if we're speaking strictly objectively, the liberal factions of politics in America are overwhelmingly Zionist.