> What, then, was their reason?
I am pointing out a historical loophole in the Oaths that Yidden exploited (and maybe Hashem provided) – immigration happened under Ottoman Empire and British mandate, in a large part with their agreement. So, at that point, Arab opinions were not relevant – they were subjects. So, after Brits left, Jews and Arabs were left to their devices. At this point, Oaths are not shayach as Jews are already in the land. Would you agree to that? So, whatever wisdom was in the decisions after that, this is not about oaths. Similarly, the next waves were of refugees from Europe/Arab countries/USSR, not political movements to conquer anything (and as there was a state already, oaths may not be relevant to new arrivals anyway).