I've read your posts and I don't get your reasoning and logic.
Palestine and the Palestinians predate WW2, fact
As for your scenario about every American wanting every Canadian dead. Ridiculous!
Yes, Palestine predates WWII. It was named by the Roman Empire after its army conquered that region.
The people who currently call themselves Palestinians do not predate WWII. They were Arabs living primarily in Egypt, Yemen, and Jordan who were extremely angry that the state of Israel was created for the Jewish people, most of whom were displaced by WWII.
Before there was an Israel, the term Palestinian referred to any person born in or living in Rome's Palestine no matter what their ethnicity, culture, language, or religion was. In the late 1800s, Arabic-speaking people living in Palestine called themselves "Palestinian" as an endonym of self-identification.
During the British Mandate, the term referred to any person legally considered to be a citizen of Mandatory Palestine as defined in the 1925 Citizenship Order. That Order remained in effect until May 1948, when the British withdrew from the Mandate, Israel was formed, and citizens of Palestine became citizens of Israel.
By the mid-1950s, the term Palestinian shifted to being a demonym that exclusively referred to the Arabs of former Mandatory Palestine who not only did not want to be known as citizens of Israel, many wanted all the Jewish citizens of Israel to die and for the state of Israel to be scrubbed from the map.
(I tried to use just the right amount of superlatives. Hope I did ok)