You are right. The USA is not a legitimate country, for the same reasons that Israel is not. They are both settler colonies created through genocide and maintained by constant violence. Many Palestinians and their supporters believe this and will say it openly.

But you are wrong in claiming that Israel is "defending itself against Hamas attacks." How is bombing children, schools, and hospitals self-defense? How is starving whole populations and driving them from place to place by force self-defense?

If Israel really wanted to stop Hamas, they would negotiate in good faith, stop confiscating Palestinian land and homes, stop funding Hamas under the table, release their 9000 Palestinian hostages.. But they don't want to stop Hamas. They want all the land, and they want the native people gone.

Look at your own story honestly before you criticize others.