What a pile of nonsense...
Whose colony is Israel? Do you even understand what this word means?
You are just parroting some propaganda lines that you don't understand. The propaganda lines that were specifically constructed to appeal to emotions (by referencing European colonialism that started with exploring Africa and India with subsequent conquest, which did result in many bad things, but has nothing to do with what happened in Israel beyond some superficial similarity).
Colonialism was bad because the colonial powers took freedoms away from the local population, siphoned their wealth to the country-colonizer while devastating the colony's inhabitants. Israel did nothing of sorts. It never wanted to have anything to do with the local population. In fact, one of the major sources of conflict was that Jewish population that came to replace the Turks who owned the land worked by the locals didn't want the locals to work that land anymore. And the landless peasants thus became unemployed / unemployable.
So, Arabs living in Israel used to be servants to the Turks, but once Jews replaced the Turks, and "freed" the Arabs, the later discovered themselves to be useless and without means of sustaining themselves. Not a good spot to be in, but hey, at least now they were "free" (I do use this ironically, I don't think they wanted that kind of freedom). Arabs, of course, thought about former Turkish land as their own (because they used to work it), but it's no more theirs than it is Jewish or whoever else inhabited that area historically.
Bottom line, claiming land based on some historical past that was cancelled by more recent historical events is a road to nowhere. And if you try to follow it, Jews probably have a better claim to that territory than Arabs, who invaded and occupied that territory later.
But, more importantly, today, the conflict isn't even about the land at all. All major players would be willing to make territorial concessions, if the core of the problem was addressed. And people are at the core of the problem, not the land. Something needs to be done with the Arabs inhabiting the occupied territories: they need to get some kind of a political status with an eye to permanency. Either completely abandon the program of building an independent state and join some other country, or the opposite. But neither seems likely. And so the conflict will go on for as long as this issue isn't solved.