Nearly 2,000 dead birds fall from sky

The media once again scrambled this past week to find the deep underlying causes of shocking events. We saw it in the rush to explain the tragic murder of six people in a shopping center in Tucson. And we saw it in the rush of stories about mass die offs of birds and fish around the country. We live in a causal universe, so all effects do have causes, but before we turn to grand overarching causal theories such as political rhetoric or government experiments, we must always remember the clustering effect of randomness and how our brains tend to look for and find deeper meaningful patterns even where none exist. There is nothing inherently hidden in such a clustering effect—no concealed forces under the ground causes the pennies to fall as they do. It’s just chance. But our brains abhor randomness and always seek meaning.

The National Institutes of Mental Health estimates that about 1% of the population suffers from schizophrenia, and that more than 25% of us have some kind of diagnosable mental disorder. As well, psychologists estimate that 1–3 percent of the U.S. population suffers from psychopathy, or the inability to feel empathy and an almost complete lack of moral conduct. Using the conservative figure of 1% and a U.S. population of 300 million people, this means that some 3 million people with either psychosis or psychopathy are walking among us, as well as tens of millions more whose mental health is askew in some way. And many of those who need it aren’t receiving treatment. Given these statistics, events such as the shooting in Tucson are bound to happen, no matter how nicely politicians talk to one another on the campaign trail or in Congress, no matter how extreme Tea Party slogans are about killing government programs, and no matter how stiff or loose gun controls laws are in this or that state. By chance—and nothing more—there will always be people such as Jared Loughner who do the unthinkable.

According to Audubon Society biologist Melanie Driscoll, about 5 billion birds die each year in the United States from a variety of causes. Because of the clustering effect of randomness it is inevitable that some of those billions of birds will die in apparent nonrandom clusters. The 5,000 red-winged blackbirds that died in Arkansas, for example, looks like an ominous cluster when scattered about the ground, but there are over 200 million red-winged blackbirds in the U.S., and according to Driscoll they fly in flocks of 100,000 to 2 million. Although 5,000 birds falling dead out of the sky sounds positively apocalyptic, it represents a scant 0.0025% of the total population.

Patternicity is what our brains do. We can’t help it. We see those clusters of events and naturally seek out deep causal meaning in some grand overarching theory. But as often as not events in life turn on chance, randomness, and statistical probabilities that are largely beyond our control. So calls for “an end to all overt and implied appeals to violence in American politics”—such as that just issued by MoveOn.org—may make us feel better but they will do nothing to alter the inevitability of such one-off events in the future.