The plain fact is that one wing of Zionism - the socalled "revisionist" wing - founded itself on the notion that the Palestinian people would have to be driven out of the land of both Palestine and Transjordan (today's state of Jordan) and that, if they weren't willing to go, they would have to be subjugated as a permanent minority within a Zionist state, or forced to leave by any means necessary.
Actually, driving out Palestinians by any means necessary was implicitely part of all wings of Zionism, even the Socialist one (as I documented recently with quotes). But the Socialists were more hypocritical about it in public. A good example is just the massacre at Deir Yassin, which Haganah denounced publicly, but in truth they knew of it before, their local commander approved it, and a Haganah unit even took part in it in a supporting role. But the King David Hotel bombing is another example -- Haganah was informed beforehand and gave approval, in fact cooperation was so intimate that that Haganah could request delays to the action pending on the political situation. (BTW, note that the dead in the King David Hotel were mostly non-British, the largest number of them Arabs.) *Lunatic*, n. One whose delusions are out of fashion.