The point you are missing (well I say you, you've just copied this off somewhere else) is that the modern day Palestinians (and FWIW many Israelis) are genetically the same people who occupied those lands from point 20 to point 1. Their ancestors were Canaanites and Jews, the Hellenized and the Romanised, Christians and Muslims.
It is their land; they have a right to it. To deny them that right, to expel and murder them, is demonstrably wrong. It was wrong in the first and second centuries AD, it was wrong in the sixth century AD, it was wrong in the eleventh and twelfth centuries and it was wrong in the twentieth. It is wrong now, and the people who support it such as yourself are wrong. One day you'll realise this.