I know what Tikkun Olam is and I can't for the life of me understand how you've managed to attach the idea of fixing the world with modern Zionism. First of all, Zionism in its current form is not your grandma's Zionism. Within Israel's most conservative administrations in ist short history are members of a coalition government who's ultra-nationalist agenda is expressly stated as a return to the biblical borders of the Kingdoms of Israel and Judea. These are religious fanatics who have conflated their toxic ideology with Zionism, which no matter how you slice it, is still a from of nationalism.
Israel's current government is not invested in Tikkun Olam - more like, blow it all to hell. Why do you think the Cristofascists are sliding around in their own lubrication with delight? The Jews have returned to Zion and their dream of the apocalypse may be soon be realized. Too bad the joke will be on them when the lights go out.