I commend you on agreeing to allow "hundreds of thousands", which would amount to perhaps 10% of Palestinian refugees, to return. In my view, somewhat paltry and not a real reconciliation offer, but better than most Zionists.
I suppose most "liberal" Zionists like to think of Jews as "natural" to the region. I don't know they square such "naturalness" with forcibly expelling most of its indigenous population, but anyway, it's a Zionist religious belief, not based on science, but more on biblical ideas regarding God promising the land to Abraham's descendants and so forth. There were some Jews who could legitimately make the claim, but science says most of the heritage of most Jews worldwide is from peoples who converted long after the biblical era in places far from Palestine. They aren't any more "natural" to the region than French Christians.
For genuine reconciliation, liberal Jews need to stop attempting to force this religious view on Palestinians.