Wow! This is really interesting with a lot of stuff that I never knew of. Such as asteroids killing more people than sharks. You always hear people complaining of going snorkeling or surfing because there scared of getting eaten by a shark. Well they're more likely to get hit by an asteroid when they walk out of there house!
Fear is a powerful emotion! I suppose a row of razor sharp teeth and being digested by a large fish outweighs being killed by a falling rock.