The Ottomans had conquered the whole of Palestine, including Gaza, and had been ruling it for some few hundred years at the time their empire crumbled and the British Empire acquired it from them. The vast majority of the population, both Arabic and Jewish, and either Muslim and Jewish and Christian, were regular citizens of the Ottoman Empire. It was not being "occupied" by the Ottomans, any more than Turkey is "occupying" Istanbul today.

Then, the majority of this population, and the vast majority of the Arabic parts of this population, were displaced to make room for the novel state of Israel, most of the population of which were Europeans and Americans of Jewish descent. They came in and took the homes of the Palestinians living today in Gaza and the West Bank, or their parents or grandparents. And then they have occupied the lands where these Palestinians had been driven away to, with direct military presence for a long time, and then with "just" a blockade and controlled movement.

And that justifies things for you some how? If someone was beating by someone else before, then it's ok to beat them now?