We get the risks wrong

Maia Szalavitz writes,

...ancient threats like spiders and snakes cause fear out of proportion to the real danger they pose, while experiences that should frighten us—like fast driving—don't. Dangers like speedy motorized vehicles are newcomers on the landscape of life. The instinctive response to being approached rapidly is to freeze. In the ancestral environment, this reduced a predator's ability to see you—but that doesn't help when what's speeding toward you is a car.

...catastrophes such as earthquakes, plane crashes, and terrorist incidents completely capture our attention. As a result, we overestimate the odds of dreadful but infrequent events and underestimate how risky ordinary events are... The effect is amplified by the fact that media tend to cover what's dramatic and exciting....

After 9/11, 1.4 million people changed their holiday travel plans to avoid flying. The vast majority chose to drive instead. But driving is far more dangerous than flying, and the decision to switch caused roughly 1,000 additional auto fatalities, according to two separate analyses comparing traffic patterns in late 2001 to those the year before. In other words, 1,000 people who chose to drive wouldn't have died had they flown instead.

Humans are ill-prepared to deal with risks that don't produce immediate negative consequences, like eating a cupcake or smoking cigarettes. As a result, we are less frightened of heart disease than we should be. Heart disease is the end result of actions that one at a time (one cigarette or one french fry) aren't especially dangerous.

If we feel we can control an outcome, or if we choose to take a risk voluntarily, it seems less dangerous....

The false calm a sense of control confers, and the tendency to worry about dangers we can't control, explains why when we see other drivers talking on cell phones we get nervous but we feel perfectly fine chatting away ourselves. Similarly, because homeowners themselves benefit if they kill off bugs that are destroying their lawns, people fear insecticide less if they are using it in their own backyard than if a neighbor uses the same chemical in the same concentration, equally close to them...

People have a preferred level of risk, and they modulate their behavior to keep risk at that constant level. Features designed to increase safety—four-wheel drive, Seat belts, or air bags—wind up making people drive faster. The safety features may reduce risks associated with weather, but they don't cut overall risk...

If the risks of smoking marijuana are coldly compared to those of playing high-school football, parents should be less concerned about pot smoking. Death by marijuana overdose has never been reported, while 13 teen players died of football-related injuries in 2006 alone. And marijuana impairs driving far less than the number one drug used by teens: alcohol. Alcohol and tobacco are also more likely to beget addiction, give rise to cancer, and lead to harder drug use.

If the comparison feels absurd, it's because judgments of risk are inseparable from value judgments. We value physical fitness and the lessons teens learn from sports, but disapprove of unearned pleasure from recreational drugs. So we're willing to accept the higher level of risk of socially preferred activities—and we mentally magnify risks associated with activities society rejects, which leads us to do things like arresting marijuana smokers...

...every day we're bathed in radiation that has killed many more people than nuclear reactors: sunlight. It's hard for us to grasp the danger because sunlight feels so familiar and natural... "We think of natural as benign and safe. But malaria's natural and so are deadly mushrooms."

Though the odds of dying in a terror attack like 9/11 or contracting Ebola are infinitesimal, the effects of chronic stress caused by constant fear are significant. Studies have found that the more people were exposed to media portrayals of the 2001 attacks, the more anxious and depressed they were. Chronically elevated stress harms our physiology

Then she offers us a quiz:

How good is your grasp of risk?

1. What's more common in the United States, (a) suicide or (b) homicide?
2. What's the more frequent cause of death in the United States, (a) pool drowning or (b) falling out of bed?
3. What are the top five causes of accidental death in America, following motor-vehicle accidents, and which is the biggest one?
4. Of the top two causes of nonaccidental death in America, (a) cancer and (b) heart disease, which kills more women?
5. What are the next three causes of nonaccidental death in the United States?
6. Which has killed more Americans, bird flu or mad cow disease?
7. How many Americans die from AIDS every year, (a) 12,995, (b) 129,950, or (c) 1,299,500?
8. How many Americans die from diabetes every year? (a) 72,820, (b) 728,200, or (c) 7,282,000?
9. Which kills more Americans, (a) appendicitis or (b) salmonella?
10. Which kills more Americans, (a) pregnancy and childbirth or (b) malnutrition?

Answers here.