Six years ago today, things changed. Enemies of this country staged an act of violence unlike any we had seen before or since. It was a slaughtering of innocents that violated every law of war, every norm of human decency, and every teaching of every valid religion. Perhaps most offensive, it was done—according to its perpetrators and their apologists—in the name of God. Today, remember September 11, 2001. Remember the victims, their families, their friends. Remember who did it, and why. Most importantly, remember that the radical Islamist fascists and their ideological brethren who started this clash of civilizations cannot be allowed to win it.