Matthew Yglesias notes that driving a car is very likely to kill your child. Yes, you--you in the back, dangling your remote starter, waiting for the lecture to be over. This is actually a really important point: owning a car is basically the leading cause of death for children.
Don't believe me? Here's the Center for Disease Control's statistics for causes of death in 2007 (I assume 2007 is the latest year for which complete data is available.)
So, "unintentional injury" is the leading cause of death, ahead of homicide by a country mile. Note for a moment that "only" 2,285 children died of homicides that year. What, exactly, makes up "unintentional injury"?
More than twice as many children are killed in traffic accidents as are murdered. The reasons for this are pretty simple: children don't die of heart disease or cancers (mostly) because they're not smokers or sedentary overeaters. (Yet.) So motor vehicle fatalities are the biggest remaining cause. And yet, people regularly choose to drive their children to school for fear of some trauma befalling their children on the way there. Because people don't regularly research childhood death statistics (and really, who would want to?) people don't realize that by unnecessarily putting their kids in a car, they're putting them in more danger, not less.