It is inadmissible to acquire land through the threat or use of force.
Yet that is precisely what the arabs/palestinians have been trying to do since '48 with every attack on Israel. Israel's gain of land was an effect of them being attacked. Threat of force and violence had already begun in'47 by the arab.
I know it is difficult to look at things from all angles after conditioning that makes it impossible to view a situation objectively.
To the indigenous people of Palestine, the Europeans that were settling in Palestine were no different than how the Europeans settling in the New World were viewed by the indigenous people of America.
It did not matter to the native people of the Americas that the Pope, for example, had divided the New World between Spain and Portugal, or that the British won the French and Indian War and took title to North America. To them, it was land they had lived on for many generations land it was being taken over by people from another continent.
It is the same for the indigenous non-Jews of Palestine.
Perhaps it would have gone better for the Native Americans had they peacefully allowed their land to be taken over without resistance. The same could be said about the Palestinians. But, that is something that runs counter to human nature. Put yourselves in the place of the Native Americans or the Palestinians. What would you do?