If I understand you correctly, you’re saying if a country is attacked by another nation state, they’re entitled to seize the territories that was used to launch the attack if they win the war, like some kind of war loot?
1. Alsace Loraine, the region between Germany and France now French, was German prior to WWI.
2. Upper Silesia, once part of Germany, became part of Poland after WWII. 13 million ethnic Germans were kicked out of Upper Silesia by Poland and fled to the reminder of Germany.
In 1948, Palestinian irregulars led by Amin al-Husseini, who had been The Grand Mufti of Jerusalem, who spied for he Nazis and was a guest of Hitler's in Berlin during WWII and who organized SS troops for he Nazis from Bosnia, as well as 5 Arab nations all sought to destroy Israel. They lost.
If the Germans can lose Alsace Loraine to France after WWI and lose Upper Silesia to Poland after WWII, then certainly the Palestinians, Egyptians, Syrians, and Jordanians should lose land for attacking Israel.
Israel left Gaza, but Hamas, elected by Palestinians took over Gaza and has been shooting missiles into Israel, most recently 10 days in May 2021, when they shot over 4,300 missiles towards Israeli cities. Israel's Iron Dome anti-missile system shot down most, but 12 Jews and Arabs died and 300 injured.
There cannot possibly be peace for the Palestinians while Hamas and not Fatah rules Gaza.
The best hope for The Palestinians is to extend The Abraham Accords -- the peace agreement of Israel with UAE, Bahrain, Morocco, Sudan to include Saudi Arabia and other Arab states. Israel was previously recognized by Egypt and Jordan.
> In 1948, Palestinian irregulars led by Amin al-Husseini, who had been The Grand Mufti of Jerusalem, who spied for he Nazis and was a guest of Hitler's in Berlin during WWII and who organized SS troops for he Nazis from Bosnia, as well as 5 Arab nations all sought to destroy Israel. They lost.
That narrative has been debunked by historians (both Arab and Israeli) for quite some time. I would encourage you to look at recent documentaries (Tantura (2022), Blue Box (2021), etc.). These run counter to the Christian Zionist narrative promulgated by a strong (and very well funded) Israeli lobby.