I'd say damn the French and British colonialist attitudes first of all and then, secondly, the League of Nations to be followed, thirdly, by the UN.
For not seeing the destabilizing chaos they'd be causing not just in what was to be called Palestine but in the whole area, from Syria via Iraq and Lebanon, all the way South, East and West.
All of this of course with the 20/20 hindsight we are equipped with today.
The final partition plan should not only have been recommended and supported by the UN and others, but vigorously enforced and then policed by robust rule, with neither the nascent state of Israel nor any equally nascent Palestinian state having any say in matters that would have gone beyond governing their very own affairs, very much as in federal states.
With Jerusalem placed under complete international governance applying rights but also responsibilities to and for all.
But that's a "what if" now and shutting the barn door on a horse long since bolted.
Any such attempt would most likely have failed anyway, alone on opposition by Arab states that otherwise had absolutely no cards in the Palestine game, let alone Soviet Russia then having seen fit to poke eyes all around.
It is now what it is and any entity still propagating the destruction of the State of Israel is up the creek without a paddle. Neighboring Arab states have long since come to realize this, unfortunately Hamas, right up at front, fails to acknowledge that simple fact, thus clingin to its delusional ideology of jihad.