What’s wrong with colonialism?

I really can’t understand what’s wrong with this, according to the vile traitorous Israeli Arabs, even if we follow their false narrative that there was a “Palestinian people” here with a “state” and a culture, and the Jews (who were already here, by the way) came and conquered and established a Jewish state. Let’s imagine what would have happened if there had been an Arab state here. It would likely have been a failing state, not economically strong, not democratic, without freedom of expression, without individual rights, without international ties, and many more things that Israel offers. An Arab today can study in the best places, travel the world, enjoy a variety of jobs, etc. For example, as a proud Israeli Jew, I would unequivocally prefer to live in a non-Jewish state, if the Jewish state were not democratic, not rich, and similar to the other horrible Arab states. So why is democratic colonialism such a bad thing?