The anniversaries and other reminders of the Islamic extremist attacks of Sept. 11, 2001, stir a torrent of thoughts and emotions. But we should try to focus on those most relevant today.

A sensitive and appropriate 9/11 museum has now been built. A new tower has emerged as a great work of architecture adding to the world’s most-iconic skyline. Lower Manhattan, specifically the immediate vicinity of the World Trade Center, which many of us feared might be abandoned in the wake of these attacks and constant threats of future attacks, has more than doubled in population.