The really really low odds are due to the statistics taking every worldwide location into one percentage. I imagine if you broke it down by individual location and for instance run statistics for 1000 US and European tourists taking a vacation in Syria for 7 days the really really low odds may change dramatically. Statistically one's chances of being attacked by a shark are infinitesimal but I don't see too many posts from people doing Great White dives from outside of a cage. Common sense is a factor here.
How about, for the sake of being realistic, we limit the geographic range of statistics to common dive destinations around the world? The odds are higher in some places and lower in others. As I see it, among all of the thousands of world traveler divers, it averages out. I'm no more likely to be the victim than another one of those other world traveler divers. Sure, you can skew the whole issue by limiting statistics to divers who dive nowhere but the Sinai and Papua New Guinea. One can be a world traveler diver or one can stay at home. Metaphorically speaking, in my city I know the odds of me getting hit by a car are higher when I cross the busier streets and lower when I cross the less busy streets, but that doesn't stop me from making my daily rounds walking all over town. I still don't view the risk of visiting places that have been the subject of recent terrorist attacks as the equivalent of me attempting to run across a busy 8-lane superhighway.