Mostly this country is working at daily life and doesn't pay a lot of attention to things like this. All the plans of the marxists and the islamists to take control of America count on this.
Alinsky's techniques count on this fact, too, that people don't generally recognize what is happening at the moment. Then they are left wondering "what happened?" By then it is too late.
It is really, really hard to convince decent, honest, hard-working people that people like the islamists and the marxists even exist, much less get them to take time out of their day to do something about them. Good people can't imagine the evil in the minds of their enemies so the good people tend to ignore the threat. That's our weakness and our enemies' goal, to take advantage of Good People for evil ends.
In other words, 9/11 didn´t teach us a damned thing.