Dave has an excellent blog post on how media affects our risk perception. Dave Hitz is the founder of NetApp.

This is the what Dave says:

"A good risk management plan should take into account hurricanes, lost tapes, lost laptops, and maybe even terrorist attacks, but realistically, headlines typically don't highlight the most important risks. You are much more likely to lose data from human error or inadequately tested backup and recovery processes than from floods or attacks, but inadequate processes don't make good headlines. In addition, headlines fade quickly – if something becomes frequent it's often less newsworthy, but the risk remains. Our more sophisticated customers, like financial institutions, build risk management models that already include the items most likely to show up in the headlines, and if they use media reports at all, it's to update some aspect of their model, like the probability of a particular event, or the impact and cost.

In summary, don't worry about terrorists until restore from your nightly backup is well tested. "

More details can be found on his blog here.