Like this map:
If we include the areas claimed & settled by the Tribes, then the original boundaries include parts of Jordan too:
I explained that according to the Torah itself, a full reclamation of our traditional Land includes Lebanon, plus healthy chunks of Syria and Jordan.
(At the time, I did not know of the opinions that include borders up to Turkey and over to the Nile.)
"So actually, we're being more than generous," I explained good-naturedly. "We've already yielded way too much."
The person looked startled, then gave a little laugh and said, "Oh. You really have! I never thought of it that way."
And I never heard this particular complaint from this person again.
I like this argument because it turns all the accusations on their head.
It also stakes you in a firm position—which is a vital necessity.
One of the arguments on which the Lubavitcher Rebbe always stood firm was the necessity of explaining to the Americans there is no compromise in this area:
https://video-tov.ml/watch/kBTlPB4_8vY (from minute 3:02)
"Holding on to the Land does not minimize peace. Quite the contrary—when the other side hears there is consideration to give them something, that brings 'intifada' and all the other negative results...
"These problems exist only because they are hearing them from those who live in the Holy Land that there is room for negotiation, that they have something to gain by it, etc..."
Look, the charedi position is basically that we don't like the Israeli government, nor do we like the way the State came into being.
But once what's done is done and the status quo is what it is...
...then you can't just let people kill or traumatize you & your fellow Jews.
There is more to this great oversimplification than that, but it's too much to go into now.
So let's leave it at that for now.
Anyway, even people who refuse to validate the Truth of Torah & who sneer at your reasons will still capitulate in the face of an unwavering stance (which is partly why the Lubavitcher Rebbe insisted on this stance).
After all, no non-Muslim believes in or even holds much respect for anything in Islam or the Koran, yet look at how those same atheists & secularists capitulate in the face of Islam simply because the Muslims refuse to waver.
So I like this argument because I get to say, "What do you mean 'it's not enough'? Our Bible insists that our Land actually includes Lebanon, plus parts of Syria and Jordan. Yet because we Jews are so generous and peaceable, we don't even consider invading or conquering those countries."
That's right! Out of the goodness of our hearts, the Lebanese may keep Lebanon, the Syrians may keep Syria, and the Jordanians may keep Jordan. Peace, man!
Aren't we Jews just so lovely & magnanimous?
So you hold that stance tight—even if they laugh—and then don't bend one inch.