This is an interesting article:
Why Palestinians fear that if they leave northern Gaza they may never be able to return
Many worry that Israel’s response to Hamas’ terrorist attack will result in Palestinians’ being permanently expelled from Gaza, stirring painful memories of the “Nakba.”
https://www.nbcnews.com/news/investigations/palestinians-fear-leave-northern-gaza-may-never-able-return-rcna120950
"...“Nakba,” or “catastrophe,” a reference to the forced removal of an estimated 750,000 Palestinians from their homes when Israel was founded in 1948. They see it as a core element of their identity. During the 1948 Arab-Israeli War, some Jewish militias massacred Palestinian civilians, the Israeli newspaper Haaretz reported, and hundreds of thousands of them were forced to flee their homes, according to the United Nations."
"“This is a sort of a collective traumatic event in the minds of most Palestinians,” said historian Rashid Khalidi, the Edward Said Professor of Modern Arab Studies at Columbia University. “Back in 1948, the majority of the Arab population of Palestine was actually driven from their homes, and these are things that people remember hearing from their grandparents and their parents.”
Some Israelis have acknowledged that the Nakba occurred, said Daniel Seidemann, an Israeli attorney who supports a two-state solution to the Israeli-Palestinian conflict. “For years, Israelis were in denial about the existence of the Nakba. It’s our original sin,” Seidemann said. The Israeli right flatly rejects that view."
"An estimated 5.9 million Palestinians are refugees today as a result of the 1948 conflict, including their descendants, according to the U.N. Multiple human rights groups and the U.N. have called for the return of Palestinian refugees to their homes, but 75 years later, many haven’t been able to do so.
The fear of not being able to return has made Gazans extremely hesitant to leave their homes. They also say travel south presents its own risks and peril as Israel intensifies strikes. As of Sunday, Israel has hit dozens of targets in the south since Oct. 13, The New York Times reported."