I may not be American, in fact i have lived in Singapore my whole life. I did make it a point to read up about the 9/11 tragedy. There was a 9/11 Commission Report that you can read
here
you can do a search for the term "flashlight" and see what pops up, but let me just quote something for everyone here.
"
Preparedness of Individual Civilians.
One clear lesson of September 11 is that individual civilians need to take responsibility for maximizing the probability that they will survive, should disaster strike. Clearly, many building occupants in the World Trade Center did not take preparedness seriously. Individuals should know the exact location of every stairwell in their workplace. In addition, they should have access at all times to flashlights, which were deemed invaluable by some civilians who managed to evacuate the WTC on September 11"
I learned this my own way sometime back in 2007. At that time there were a number of earth tremors in Sumatra and the aftershocks were felt in certain parts of Singapore, the building i was working in (Gateway for the benefit of my fellow Singaporeans) was hit and the building was literally swaying. We had to evacuate down the emergency staircase and the lights went out (think a circuit breaker tripped) and the emergency lights werent working 100% i.e. some were, some weren't.
It was at that point that i was thankful that my Sony Ericsson k700 had a built in LED that could be turned on and used as a torch (easily 10-15 lumens if not more).
It was after that that i got my Ultrafire C3 and a few months later my Jet I MkIIx.
As for carrying lights to class? Heck i would if i was still in school, i would have had great fun as we used to study late at night on campus and there were many great dark areas to explore like the canteens and all.