This is a curious argument one often hears these days i.e. one cannot do anything about the settler enterprise of Israel because it is a "fact" that cannot be undone. No more than say, giving America/Canada/Australia or New Zealand back to its natives. ie an ongoing occupation is compared to one where the demographics have been adjusted by various means in favour of the settlers, ignoring that the Palestinians [all 10 million of them] are still there. By this logic, what right does anyone have to stop any future genocides? Why can't everyone get their turn at it?