You are right, but you are missing one small detail - the Philistines were of the Greek origin, i.e. had nothing to do with the current Palestinians who are Arabs. I'm afraid I don't remember the name of one of the PLO leaders to whom belonged the famous quote "that night i went to bed an Arab and woke up a Palestinian".
You are right, Palestinians weren't originally Arabs. They were Jewish (unlike the Philistines, who in turn were Greek). And as I've mentioned the name Palestine has appeared millenia after the land was conquered by the Jews. Before the Romans have come up with the name, the land was Judea/israel, and even before than Canaan. Well I guess when the Canaanites come back, we can discuss giving the land back to them...
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As you can imagine, I'm aware of that. We however had a discussion about presidents of a state of Palestine that apparently existed before the ebil Juice "stole" the land from them, i.e. pre 1948 (or hell pre 1967 if you so prefer).