It's based around a Jewish family but it really is a universal theme about getting along and coming along.
You were able to sing something they related to instantly, because it was part of what you felt. It was part of what you had already traveled through. It's part of the people you were associating with daily. It was all of that.
There really can be no peace without justice. There can be no justice without truth. And there can be no truth, unless someone rises up to tell you the truth.