Check out: '1,667 Times Square-Style Attacks Every Year' on Slate

I thought you might find this Slate article interesting:

1,667 Times Square-Style Attacks Every Year
By John Mueller, Mark G. Stewart
http://www.slate.com/id/2303169?wpisrc=sl_ipad

Putting this all together, we find that, in order for the $75 billion in enhanced expenditures on homeland security to be deemed cost-effective under our approach—which substantially biases the consideration toward finding them effective—they would have to deter, prevent, foil, or protect each year against 1,667 otherwise successful attacks of something like the one attempted in Times Square in 2010. In other words, we'd have to foil more than four major attacks every day to justify the spending.

---Sent from Steve's iPad...