There is more to this than number of people killed. How about number of lives ruined by a terrorist attacked. After 9/11 we had a lot of businesses go under, thousands of people in many travel industries lost jobs. The economic consequences were quite high. Back when you had a group of terrorist blow things up, the markets were not really affected. Today any attack on western countries cause huge issues. Part of it is the futures markets. I am not sure what the solution may be, but it has to be addressed.