> This seems like a leap of logic.
a) There are no illegitimate states
b) Israel is unique and unquestionable
...<then non-sequiturs about South Africa and Rhodesia>
I am a Westerner. One of my core beliefs is that rationalism and logic leads to truth and correct action; conversely that irrationality and emotionalism leads to suffering and poor decisions. I'm not pro-Israel because I've chosen "team Israel, right or wrong". I'm pro-Israel because the pro-Israel arguments that I've heard are far more rational than pro-Palestinian arguments. I do seek out anti-Israel arguments, hoping to find something rational, but so far, nothing. Again, my goal is truth and correct action, not tribal chest-thumping.
Your arguments here did not hit the mark. I do not accept that South Africa or Rhodesia are appropriate comparisons, and therefore their inclusion was a non-sequitur.
Further, my null hypothesis is that Israel is an unremarkable state, not "unique and unquestionable". I therefore interpret Israel as doing only that which any Western nation would do in the same circumstances. Yours appears to be the obverse, that Israel is uniquely questionable. Maybe it is? You'd have to supply evidence or arguments compelling enough to match that thesis, for me to be convinced.
If you do want to earnestly go down this path of becoming the first to construct actually rational arguments against Israel, you won't be able to just throw around emotional shorthands like "apartheid", "Nakba", "settler-colonialist", etc. It's lazy emotionalism designed to stop rational thought. It will convince only those who are already convinced, but it's not a rational argument.
If you want to argue rationally and compellingly that Israel is "an apartheid state" then understand the strongest arguments against using that term, and dismantle those arguments. We pro-Israel peeps have heard all the accusations, but have never heard any considered, thoughtful, direct, courageous rebuttal of the "Israel is not apartheid, actually" arguments. Just more emotionalism.
I do bet that if you take the journey to understand the arguments for and the arguments against you will conclude that it's not appropriate in Israel's case. But! Maybe I'm wrong about that! Maybe you will come up with a really rational, dispassionate argument that Israel is an apartheid state and all rational people will be compelled to follow the truth, reluctantly or not.
Good luck. I honestly look forward to see what you come up with.