There's no question the level of what we traditionally think of as 'heroism'... between a firefighter going back into the second tower after the first collapsed and say, a receptionist watching one of those jets head straight for her windowpane...is a credible difference
It's not certain if any firefighters went into the north tower after the south tower collapsed. What is known is that a large number of them had assembled at about the 35th floor of the north tower, preparing to head higher up, when the south tower fell. They were ordered to get out of the tower ASAP, and just barely made it before the north tower came down.
Most FDNY (and possibly NYPD and PAPD) deaths occured when the south tower fell. It's difficult to determine whether their actions constituted heroism. Going into a burning building of course requires a lot of courage under any circumstances, but the question is whether anyone expected the tower to fall. It seems to be the consensus that the FDNY commanders (many of whom died) did believe there was a chance that the tower would come down, but thought that would not happen for several hours. So I suppose you could say that the emergency personnel who died in the south tower were acting bravely, no doubt about that, but did not realize just how great the risk really was. Can you call that heroism? I suppose that depends.
At any rate, I consider the hero-or-victim issue rather unimportant. The people who died on September 11 died tragically. It didn't matter how bravely they acted, the end result was the same.
"Let me think about it" = the coward's way of saying "no"