The walls between races and tribes, natives and immigrants, Christian and Muslim and Jew cannot stand. These now are the walls we must tear down."
America is not built on tearing down things, but on building things. America is not built of demanding that we all be the same, but that we just respect common laws and codes in the secular world and individual religious rights. It is when secular laws are rejected... torn down to be replaced by religious and cultural laws.... that we run into trouble.
Because when you start tearing down the walls, who will determine what is right and what is wrong? Our system has proven the best there ever has been at retaining traditional and culture and religious differences while providing the legal and secular glue that keep the groups together, eventually producing an end result that is acceptable to everyone.
We tinker with this process at great risk.