It goes without saying (but I'm saying it anyway) that killing thousands of people is terrible. On the scale of the thousands who die daily all over the world, the main difference in 9/11/2001 was the cost of the real estate destroyed.
The other main difference is that most US citizens never thought it could happen here. Now they have to think about it.
Lessing has done nothing but point out that others have been thinking about it all their lives. They've lived -- or live -- with the terror of bombs or kneecapping or lingering deaths down dark alleys every day of their lives.
Lessing has pointed out that the US is not special.
Crossposted from Acid Test