America is unique.  Unique in that it is multi-cultural, multi-religion, multi-ethnic from the beginning.  This isn't just a dream or idea.  We are still here after 240 years.  That must be a really long dream.  It's called "it really works".  But for it to keep working you need something that binds people together, something in "common".  That was the constitution (liberals throw that out), Judeo/Christian ethics (liberals throw that out), civility/sexual mores (how 1950's?).  They ridicule and destroy everything that gives people a sense of belonging together and then wonder what happened.  Throw a bomb into society and this is what you get.  Even the author acknowledges that a parade or everyone sitting on a stoop binds them together.  Since we've gotten rid of the other more important things, that's all that's left to "bind" us together.