Well, that, and that every time the Arab states have gone to war with Israel, even though the combined Arab states (and most of the individual states) are far bigger, the Arabs have lost.
Imagine if the United States went to war with, say, Cuba, and Cuba won. Imagine Cuba not only threw back all American attacks, but occupied Florida and refused to hand it back until they were damn good and ready. How popular would Cuba be in the United States? My guess is it would be almost universally hated, denounced frequently, accused of all manner of gruesome atrocities, blamed for all or most of America’s problems, and made the subject of lurid conspiracy theories to “explain” how this tiny place came to have such disproportionate power. Sound familiar?
Never underestimate the corrosive power of humiliation. And being licked, repeatedly, by a geographic and demographic pipsqueak is pretty damn humiliating.
(And before you start replying, no, I am NOT suggesting the Israelis should have lost so the Arabs could feel good about themselves. That would be insane. In the long run the solution is for the Arabs to either get over the humiliation, or find some other way to feel good about themselves, something that doesn’t involve smashing Israel. Neither one is going to happen quickly, and the Arabs have to find other sources of pride for themselves; no one else can find it for them.
(The same also applies to Iran, which needs to find a national destiny that doesn’t involve smashing “the Zionist entity”. But Iran is not a neighbor of Israel, and most Iranians are not Arab; I wonder if the average Iranian would care much about Israel if the ayatollahs in charge could shut up about the place.)
Anyway, the OP: The original UN resolution on the subject provided for the territory to be divided into a Jewish state and an Arab state. If Israel has no legal right to exist, then UN resolutions mean nothing. (Which in turn means Israel has no legal obligation to obey any UN resolution affecting it, including the famous one about evacuating the territories occupied after the 1967 war.) Absent a legal structure of some kind, “right to exist” can only be established by force. Force, so far, is working just fine for Israel.