There is exactly one sensible response to the September 11th 2001 attack on the World Trade Center towers: Find the people who did it, and kill them. We don’t need to “commemorate” the event. Who’s going to forget it? And we don’t need to regard the site as “holy”. That’s the kind of perverted thinking that got the towers destroyed.
We need to find the people who did it. The creeps who flew the planes are dead. But the super-creepy men who (from a safe hideaway) demanded that it be done, and planned it all out, are still alive. I think they should be killed. But no one even talks about them anymore. Instead we get parades and speeches and hymns. In other words, no one is trying to solve the problem! Instead, they are trying to turn the situation to their own advantage. It makes me sick.
YASHWATA 
A government-sponsored death penalty is not in general a good idea. 9/11 is a special case. The men who organized it are public figures. They have boasted about it on video in front of the whole world. They live by the sword and they should die by the sword. They are practically begging for it.
I must say I am quite shocked that a secular humanist claims that ‘they should be killed’. Probably there is some difference between humanists in America and Europe. Overhere no humanist would say such thing. IMO a humanist is against death penalty by definition. It is very hard to make it up to someone if the law judged and executed the wrong person.