Well, it was a mixture of being evicted and leaving in 1948 so that the Arab armies could have a good go at the Israelis - in their homes, their villages, their farms.
I believe firmly in having a Palestinian nation, but not with Israelis giving up sovereigny over territory captured in 1948. On what reasonable basis could you possibly demand its return? Can Germany argue for the return of Prussia and the Sudetenland? Should Japan have the Sahkalins back?
Are they asking? Were native Prussians and Sudentanland replaced by Arabs? Were native Sahkalins replaced by Africans?
The Palestinians were replaced by Europeans