Except those people are dead. Those who ethnically cleansed Arabs (and Jews) during the nakba are dead. Almost everyone who was ethnicity cleansed is now dead. At a certain point you need to recognize that a new generation has been born into this conflict, and with it, a change in circumstances. Attitudes like yours ignore that Israelis who were born there don't have another home to 'return' to.

That doesn't mean that Palestinians don't have a right to resist occupation, but the circumstances are significantly materially different today then 40 years ago.