What about Arabs conquering Palestine in the 7th century and expelling people from their homes? https://en.wikipedia.org/wiki/Muslim_conquest_of_the_Levant#...
Plus, many Arabs left their homes because they told them to do so. They expected them to be able to come back after they finish killing the Jews, which never happened, and hopefully never will.
They Arabs had multiple opportunities to settle this conflict, it's purely a result of their own making.
How far in history do we need to go for context?
- 67 (6 day war)?
- 64 (PLO founding)
- 48 (Israel independence)?
- 1920 Nebi Musa riots, 1921 Jaffa riots, 1929 Palestine riots, 1936–1939 Arab revolt in Palestine?
https://www.jewishvirtuallibrary.org/origin-of-quot-palestin...