I'm neither a zionist nor an anti-zionist, and I do agree with Brittain above that millions of Jewish people and families have built lives in the State of Israel so that any idea of them going anywhere is completely unjustifiable, no matter ones opinion on how the creation of Israel was handled.
This is basically my position. I don't know whether Israeli should have been created, but I do know that it
was created, and it is now a country with millions of residents who bear no responsibility for the circumstances of it's creation, and who just want to be able to peacefully go about the only lives they know. They have a moral claim to the land just because they are currently there, not because of any claim their distant ancestors might have had.