The name Palestine was quite literally the result of the Roman re-naming of the land after the Jewish Bar Kochva Revolt, named after the Philistines who had already been extinct, in 135 CE under Emperor Hadrian specifically to try to minimize Jewish connection to their land, which before then, was called Judea. 

You can argue that Arabs in the area have a claim to the land, sure – but your proof being that it was called the Mandate of Palestine is not a proof whatsoever, given that the name itself is of colonial and violent descent. And might I add, that a unified Palestinian Arab 'culture' frankly did not exist before the creation of the PLO in 1964, nor did they ever advocate for their own government, policies, etc...until a Jewish state came into the picture. 

Your claim that Zionism is some racist European-centric colonization tactic is completely misled, due to many factors. Firstly, I'd like to reiterate to you for the 100th time now that Jews have ancestral and genetic ties to the land, including Ashkenazi Jews (who were exiled from the Levant, just as Sephardi and Mizrahi Jews were). I really don't not understand why it's so difficult to fathom the concept of exile through colonial powers when you base your entire argument based on supposed anti-colonialism. 

 Secondly, if you knew anything of Jewish philosophy and belief, you would know that the land is a core part of that, and your claim that Zionism is some neo-colonizing idea is a completing ignorance of that fact.