[sudosysgen]

Palestinian refugees have to stay refugees because they are stateless. Stateless refugees, unless they can find some other citizenship and therefore no longer are just Palestinian - and they often can't, must remain refugees for eternity. Since children normally inherit citizenship, that goes for their children too, until they are something other than Palestinian, nationality-wise.

And they didn't "leave". They were ethnically cleansed.

[tguvot]

per unrwa, palestinians that have citizenship of whatever other country still remain listed as refugees.