The lesson of the years we have spent fighting terrorism since Sept. 11 is that every time we depart from our values we worsen the very problem we are trying to contain. We must never allow our values to become the collateral damage of a search for greater security. Shutting our door to refugees or discriminating among them is not our way, and does not make us safer. Acting out of fear is not our way. Targeting the weakest does not show strength.

If we send a message that it is acceptable to close the door to refugees, or to discriminate among them on the basis of religion, we are playing with fire. We are lighting a fuse that will burn across continents, inviting the very instability we seek to protect ourselves against.

.. we do it to uphold the United Nations conventions and standards we fought so hard to build after World War II, for the sake of our own security.

If we Americans say that these obligations are no longer important, we risk a free-for-all in which even more refugees are denied a home, guaranteeing more instability, hatred and violence.

If we create a tier of second-class refugees, implying Muslims are less worthy of protection, we fuel extremism abroad, and at home we undermine the ideal of diversity cherished by Democrats and Republicans alike: “America is committed to the world because so much of the world is inside America,” in the words of Ronald Reagan. If we divide people beyond our borders, we divide ourselves.

The lesson of the years we have spent fighting terrorism since Sept. 11 is that every time we depart from our values we worsen the very problem we are trying to contain. We must never allow our values to become the collateral damage of a search for greater security. Shutting our door to refugees or discriminating among them is not our way, and does not make us safer. Acting out of fear is not our way. Targeting the weakest does not show strength.