From NPR [http://www.npr.org/blogs/health/2010/08/30/129531631/5-worries-parents-should-drop-and-5-they-should?sc=fb&cc=fp]:
Based on surveys Barnes collected, the top five worries of parents are, in order:
Kidnapping
School snipers
Terrorists
Dangerous strangers
Drugs
But how do children really get hurt or killed?
Car accidents
Homicide (usually committed by a person who knows the child, not a stranger)
Abuse
Suicide
Drowning
Why such a big discrepancy between worries and reality? Barnes says parents fixate on rare events because they internalize horrific stories they hear on the news or from a friend without stopping to think about the odds the same thing could happen to their children.
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Just an example of how uncommon it is for people (in general) to worry about the things that have a much higher probability of happening. Humans are weird.