> It's not an impossible thing to happen but it is so unlikely that I don't go around letting the idea dictate anything about my life.

Another take: the likelihood of getting struck by lightening surely dictates what you do during a thunderstorm? In the same way that the likelihood (or lack there of) dictates how often you buy lottery tickets.

If we didn’t attempt to mitigate terrorist attacks at all, would they be as infrequent as they are now? I know that’s not really what you’re saying, but surely likelihood is extremely dependent on circumstances.