Yeah it's never OK but do you also think Finland should get Viipuri back? That was the second-largest city of Finland, the Soviets took it in WWII and kicked out all the Finns and that was that. It's now Vyborg, a sleepy Russian town of little importance. That was a catastrophe too.

Do you also think Lviv should be Polish? And Wrocław German? And Trabzon Greek? No wait I mean Armenian, which do we even pick, seriously everybody wants Trabzon! Should the entire Arabian peninsula be Turkish again?

Where does it stop? Why should Palestine be restored to its one-time borders but not the rest? All this happened in a time when moving populations around at the whim of a few imperialist rulers was considered a super normal thing to do. That doesn't make it right, but the Nakba isn't a particularly unique historical event. Get over it, and focus on the actual current events that are also bad, such as the settlements, decades of effective imprisonment of everybody in Gaza, and so on. There's plenty of good arguments! But "from the river to the sea" is a far right revisionist talking point and in my opinion it does an enormous disservice to the Palestinian case.