As a US citizen, the loss of almost 3000 people on Sept. 11 is tragic. As I did not know anyone personally who died at the WTC, it is not the focal point of what I think about when Sept 11 comes up. Looking back on the last decade, I saw liberty be sacrificed for security, an already corrupt system become worse, an powerful economy that took a nose dive, soldiers fighting and dying for no reason, basic human rights denied, racism and hatred skyrocketed, the media became a laughing stock, and a laundry list of other issues that have contributed to the fall of the US. All of it made possible by apathy, greed, and uninformed masses feeding an abhorrent xenophobia. People are letting their lives be controlled by fear. The change we wanted is not the change we received.
On an international level the loss is greater. Due to the US's response to the attack, multiple countries are destabilized, hundreds of thousands of innocent civilians are dead (200K at least), and the world economy is in an uncertain state. Feel free to add to this list, my knowledge of how the US's response has affected other countries around the world is limited.
For me, Sept. 11 signifies the day when the world changed for the worse. I'm right there with Benjamin Franklin, "He who sacrifices freedom for security deserves neither."
On another note, Sept 11 in Chile means something completely different. On 11/9/2011 (the date as it is written internationally), General Augusto Pinochet initiated a coup d'état against DEMOCRATICALLY ELECTED President Salvador Allende with the financial backing of the United States of America, thus beginning a military dictatorship marred by severe human rights violations. If you are seeing bunch of parallels here, trust me you are not the only one.
If it seems "unamerican" for me to think in this manner than I invite you to remember what the US used to stand for.