Would you argue that most states worldwide are false/invalid and should be relitigated? (As just about all of them were constructed in areas containing prior people, and against the will of some of those people.)
No, as I had said before, timing maters. Fresh wounds still bleed. Centuries or millennia old ones are too late to be reconsidered. Past crimes cannot be changed but current crime can and should be fought. Eg if the people of Hong Kong want a greater independence from China, I'd fully support that. But english fighting normans is too late.
That's a remarkable position, thanks for being honest about it. So israel is currently pursuing what is in your eyes the only possible route to legitimacy - i.e., maintaining ownership while the ~200-year clock counts down?
Past crimes being hard or impossible to prosecute doesn't mean current crimes can't be prosecuted. Israel is illegal today and today it is just and moral to do everything possible to repel them. I would have supplied Natives with fighter jets if they were being invaded by "Americans" today. If some entity manages to keep it for 200 years without trouble, then I'd consider it a legal state. And that entity might as well call it Qin Shang or Provincia del Levante or anything else.
This is of course distinct from the mere practical fact of some entity owning some place. Russia currently owns places that are justifiably Ukrainian property but it doesn't make its ownership claims valid. If it can keep on to it for a few centuries stably which is to say without internal threads to break off or constant barrages of freedom fighters haven't existed for 200 years and people legitimately identify as Russian, then it is Russia. Otherwise it is not, and I support arming and aiding Ukrainians to repel the invaders.
I believe we must help Iran, Lebanon, etc build nukes. This will have the added benefit of the gulf arab countries being forced to build nukes and Israel's mindless hyperviolence having a degree of checks and balances put upon it.
Let me ask you a question now, you said you don't agree with everything your government does. Would you disagree with shooting illegal settlers who are right now robbing others lands? Why or why not?