I don’t understand why people think this is a good argument. Lots and lots of places shifted in control since 1948. Poland moved half a country to the left, world empires got decolonized, India and Pakistan split and then the latter split once more, all with enormous population movements, the list is nearly endless. “All of that should revert to how it was before, even if at the cost of kicking out or killing everybody who live there” is a pretty extreme revisionist take.
In all these countries, “we should restore our borders to $maximumSizeEver” is widely understood to be a far right take (the Russians want Ukraine, the Greater Hungary people want Transylvania, the Greek neonazis want Trabzon (!), everybody wants Kashmir, etc etc etc). It’s a far right talking point. But for Palestine it’s somehow a mainstream opinion. I don’t get it.
I mean, there’s lots of good arguments to be made for the Palestinian case IMO but I don’t find “they once had more land and therefore they should get it all back no matter the consequences” very compelling.
Karelia is another one. Whether or not such situations are resolvable peacefully is entirely up to the nations involved.
I don't see why revanchism gets a free pass in the specific case of the Palestinians.