Do we do that for various financial endeavors and shut them down due to the economic risk posed? Cost of 9/11 was rather large, but it was not that large simply

Do we do that for various financial endeavors and shut them down due to the economic risk posed? Cost of 9/11 was rather large, but it was not that large simply due to terrorism, it was that large due to the failure of various measures meant to prevent it... all aligning into a perfect storm.