The CEOs I've met are only terrified of Wall Street, their investors, and maybe their board of directors. Personal risk is a factor they have long taken into account, and security services are typically provided and paid for by their corporation. Also they're paid plenty enough to afford secure living arrangements in gated communities, including lavish bunkers in the case of the Waltons of Walmart infamy. They are ready now for the "last man standing" scenario.
I didn't say they feared for their personal safety. What I was saying is that they must be in fear of being seen as useless, by Wall Street for instance. I've met a few myself. The "War on Terror" seems like it would help maintain the illusion that the party might indeed be allowed to go on forever. Anything else runs too big a risk of the wrong people noticing the handwriting on the wall. Sure they will withdraw to their bunkers, but not until they absolutely have to. The key question is, will they ever come out again?