There is only unity under Islam - all else is the field of war ....
Abu Mazen is a figurehead. “Unity” would mean that Hamas would be in charge of the West Bank too. But I don’t think the remnants of the PLO (or the Israelis) would let that just happen.
Abu Mazen goes by a much more historic and consequential name, Mahmoud Abbas. Abbas was Arafat’s banker. Along with the ‘leaders’ of Hamas, the PLO has billions of dollars they will never use ‘for their people.’
Israel should scrape every bit of Gaza, above and underground, and then vet anyone wanting back in.
Israel is a western nation and that is one of the reasons why Israel is hated so much. Western nations offer prosperity for everyone. Islam hates prosperity because like all theocracies the goal is to keep its followers uneducated and subservient and following their religious doctrine.