Don't forget how they colonized and got the land in the first place (Hint: they terrorized a lot of people to get it).The Jews were driven out because they transgressed God's commandments and also murdered their own Messiah whom they were awaiting. Palestinian is a modern name and invention for Arabs from the Middle East.
https://en.wikipedia.org/wiki/British_Mandate_for_Palestine_(legal_instrument)
Nothing on that Wikipedia page says that there wasn't a people living in Palestine called "Palestinians". There are primary documents prior to the British Mandate specifically identifying the people of that region as "Palestinians" such as Khalil Beidas writings in the 1800s. Regardless there were humans living there for thousands of years and then all of a sudden you have a bunch of European Jews drop in on them with weapons and money.