Why would that be the Arab governments' task? I hope you don't think the neighbouring Arab states' military response to Israel's unilateral declaration of independence is an all-Arab war crime comparable to Nazi Germany's, and you don't buy the broad Zionist (I'm afraid to say not just Likudnik) spin that the more recent development of Palestinian identity and the existence of the pan-Arabist ideology means that there are no real inter-Arab distinctions and all refugees are just 'Arabs'.

(Besides, no one thought this situation will last 50 years.)

_{*Lunatic*, n.
One whose delusions are out of fashion.}