The trial analogy is also completely false. The appropriate adjustments to this story is that nobody broke into that house, you actually own the house and it's always been in your family, no necklace was stolen, but you're still put on trial for stealing a necklace that doesn't exist from your own house because you're Jewish.
Your last statement of "fact" is also not fact. It is simply not factually true that all the people that lived in the region have been living and thriving there for thousands of years since before the Israelites. Many Palestinians have immigrated to the area in fairly recent times. Many Gazans are from Egypt. There are probably some Palestinians who do trace back to the Israelites. In general much of the population of the Levant and the middle east in general, including the Israeli Jews from all over the place, goes way back but there's no specific historic continuity of Palestinians in Israel for the most part. There was plenty of population movement and immigration. This is well supported history with plenty of archaeological evidence.
I also think the characterization of Israel as being "founded on the belief that its claim to the land and resources was categorically more legitimate than" is also false. There was no comparison of legitimacy of various claims simply because there were no other claims at the time. Israel was definitely founded on the (factual) belief that it is the historic homeland of the Jewish people who feel a strong connection to it. What we see in practice is that a person of Italian heritage, living in California, taken by force from Mexico, with the aboriginal inhabitants confined to a reserve and all their resources literally stolen after they were genocided and ethnically cleansed, is telling Israeli Jews why their country, founded on their historical land, where they went as refugees in more recent times because they had nowhere to go to, is illegitimate. If we want to litigate every country's legitimacy going back 3000 years, sure, let's do that. Are you an immigrant in Canada? better start packing since you're going back to where your ancient ancestors used to live. This is ofcourse all total nonsense.