Should the Zionists vacate the whole of Palestine?

Some of the most ardent supporters of the Palestinian people (George Galloway, The Young Turks, etc.) are, to my dismay, reluctant to go the whole hog and say that the Zionist occupiers of Palestine should go back to the countries they came from. They only want the Arabs to set up their state on the West Bank within the 1967 borders. In other words, according to them, if most of the rooms in your house have been occupied by criminals you should not demand that the criminals get the hell out of the house but settle for the rooms left to you. Would any human being be able to do that? Of course not! Get real, people.