Because to admit those 66-year refugees back amongst them is to commit National Suicide.
Ain't gonna happen.
.
Beyond that is the fact that precious few of the Arabs who are being called "refugees" are over 66 years old, so could have even been born there much less owned any land (which the vast majority didn't to begin with).
Tinmore, Coyote et al have simply bought in to the propaganda that the Arabs who began calling themselves "Palestinians" for tactical purposes have the right to flood into a land in which they have never lived, and where their grandparents and great grandparents never owned property simply because of the fact that hey created this new identity as a propaganda tool.
Arabs were already given 78% of Palestine, so the invention of these brand new people was just a ploy to start working on the other 22%.
The real point being, we need to deal with the here-and-now, rather than 66 years ago, or 100 years ago, or 150 years ago, or whatever.
The Jews now hold the land.
The Jews will still be holding the land 100 years from now.
The Palestinians have lost.
The Palestinians are squeezed onto a few postage-stamp -sized pieces of land, and they need more room to breath.
The Palestinians are going to have to move elsewhere, in order to find that breathing room.
The sooner they pack up and leave and move somewhere else, the sooner we'll have peace and quiet that stands a chance of lasting for some time.
Sucks to be a Palestinian, no doubt, but that's the way of it, as things stand now.
They're in the way - they got their butts kicked - and now it's time for that Loser's Walk, to clear off, and build new and happier lives for themselves, someplace else.
It's time for the UN to step-in and to negotiate a resettlement of the Palestinians in one or more neighboring countries, and to evacuate the few remaining postage-stamp -sized scraps of Old Palestine that they still hold.
They are a defeated and only loosely-knit-together people and they (1) need to clear off, in order to establish a more lasting peace and (2) deserve better lives, elsewhere.
I would be ecstatically happy for the United States - as part of a Palestinian evacuation and resettlement - to join with the rest of the world, to help the Palestinians with moving costs, wergeld (compensation for their troubles), new infrastructure for their new location(s), and with some considerable startup capital and funding, for their first decade or two on their own, in some new location or another.
The Israelis have the upper hand.
The Palestinians cannot win, or even substantively improve their position any longer, where they are now.
The world is not going to force Israel to allow Right of Return or any of that happy horseshit.
Beyond the domains of Islam, the rest of the world does not feel strongly enough about the Palestinians, to risk making war on Israel, on behalf of the Palestinians.
So, if the Israelis have the upper hand, and the Palestinians can't win, and if the world isn't going to bludgeon Israel to death, then what's left?
(1) Perpetual continuation of the present state of affairs, with minor variations, or (2) relocating the Palestinians and giving them a fresh start elsewhere, out of harm's way.
(1) is unacceptable to all concerned, in the long run.
(2) seems most probable - consequently, the sooner the world begins down this path, the fewer lives will be lost in future, and the sooner we'll have peace and quiet.
Q.E.D.