Why should Arab countries fix a problem they haven't created?
This looks to me as a proxy war led by the US, Israel went too far with killing civilians, and now the US needs some PR to look good in the books of history.
Haven't Arab countries contributed to both sides of this conflict? One, by expelling all Jews in their countries to Israel. Two, by supplying arms and aid to Hamas.
Because Romanian authorities can reasonably believe many of these Ukrainian neighbors will be allowed to return once hostilities are over. In contrast, history has shown once and again that, once Israel manages to expel Palestinians and take their lands, none of them will be allowed to ever return. Taking refugees become the same as abetting ethnic cleansing.