That is a working theory at 4chan. And that some extra sugar involved in the plot is the large-scale sale of new, expensive body-scanners etc. (and training and maintenance and upgrades) to casinos, cruise-lines, schools, concert venues and many other such soft targets. Plus additional police powers.
"If we change the way we live EVEN A LITTLE..? The bad guys WIN..!!!!"
But behold:
EVERYTHING about the way we live has changed and now will change much more.
Remember years back when people would refute an idea they viewed as outrageous, they would get all exasperated and say:
"Hey, THIS is AMERICA..!!!"
Notice the way you don't hear that ANYMORE..?