Let us remember all the 9/11s, past and present.
Is there a difference between killing civilians using an Apache Helicopter or a commercial airline?
If we consider all human life to be the same, then we should remember all the victims. Concurrently, we must condemn all acts of terrorism, and in proportion to the level of carnage.
9/11 of Gaza - Almost 2000 people slaughtered by Israeli forces with the aid of US made weapons.
When the Israelis die it is terrorism, but when the Arab children are murdered, it is self-defence, war, measured response, collateral damage etc.
9/11 of Lebanon.
Thouands of civilians killed through state-terrorism.