I‘m gonna answer your strongest points on material grounds though, and ignore your more racist stuff.
> The "right of return" (meaning the inflow of millions of third, fourth and fifth Palestinian descendants from neighbour Arab countries) is their - and the Arab's world - tool to dismantle Israel.
That is a) just your opinion, and b) irrelevant in the context of human rights. The Palestinian were unjustly expelled and they have a right of return under international law. Israel had no right to expel them in the first place, the expulsion was a historic wrong, and for justice to resume they are owed the right of return as well as reperation. Whatever that does to Israel’s demographics is a non-concern in the context of international humanitarian law. If such a right were granted and it would result in Israel no longer being a majority Jewish state, that would simply be a new reality we would have to deal with. Minority rights are a thing that international law also guarantees, and surely Jewish Israelis should be happy living is a minority in a land which guarantees their rights as such.
> The suggestion that Jews admit defeat, hand their heads to Hamas and the likes and ask for forgiveness does not resonate as sane.
We have been here before, and yes, this is the sane option. Rhodesia admitted defeat to the terrorist organizations ZANU and ZAPU, South Africa to the ANC, The French Algerians to the FLN (which was probably more brutal than Hamas). And outside of settler colonies we have South Vietnam admitting defeat to the Viet Cong. Brutal regimes which owe their existence to the oppression of others like Rhodesia, Apartheid South Africa, French Algeria, and South Vietnam are frequent targets of terrorists, those same terrorists often become the ruling power post liberation, and the settler (or otherwise the beneficiaries of the past oppression) most of the time are able to live just fine under their new rule without the systemic oppression. In all likelyhood, even if Hamas were to rise to power in a post-apartheid Israel state (which honestly is rather unlikely) chances are they would not be able (nor even willing) to exert the kind of oppression onto a hypothetical Jewish minority in such a state.