It’s easier for a Palestinian to get citizenship in Israel
Hell no. Should Zainichi have an easier path to citizenship? I do think so, here in Germany we have an accelerated procedure for people who were born and went to school here, no matter the parentage. Is it any more involved to get Japanese citizenship as a Zainichi than as a German? Nope.
Not allowing dual citizenship isn’t anything out of the ordinary either, btw.