I would argue that Jewish solidarity is actually one of the better ways to improve the world. To turn Cynthia Ozick's phrase on its head, the Jewish approach is "the universalism of particularism".
At the chuppah, everyone had a good cry; the Rabbi, the Mossad commander, and the bride and groom. These were the tears of a big family reunion, a reunion that brought together Jews from around the world.
These tears are transformative. They reflect a Jewish commitment to connect with other Jews, no matter how different and distant; and they are a model of how the entire world can transcend their own differences.
 Jeremiah 29:7
 See “Hanoten Teshua' The Origin of the Traditional Jewish Prayer for the Government”, by Barry Schwartz, Hebrew Union College Annual, Vol. 57 (1986), pp. 113-120
 Amos Elon, The Pity of It All: A Portrait of Jews In Germany 1743 – 1933, page 338
 See Moral Tribes: Emotion, Reason, and the Gap Between Us and Them, by Joshua D. Greene, Penguin Publishing Group, 2013
 Genesis 17:15
 Yes, there has been more than enough division as well. But that actually proves the point; only a people deeply concerned about unity would constantly worry about divisions and infighting.