If I were to make up a list of catastrophes that I most worry about affecting me — and it's not my style to do so — I suspect being killed by a terrorist of any kind would be way, way down the list, down around perishing in a cattle stampede. I'm not trivializing any death by terrorism — they're all horrible — but let's not obsess about that as if it's a likely fate. Andrew Shaver explains why it isn't.