There's no reason that we should give up that lever on people's behavior - namely, the inhibition systems of the brain - just because we're coming to understand more about the temptation systems.

Of course genes can’t pull the levers of our behavior directly. But they affect the wiring and workings of the brain, and the brain is the seat of our drives, temperaments and patterns of thought. Each of us is dealt a unique hand of tastes and aptitudes, like curiosity, ambition, empathy, a thirst for novelty or for security, a comfort level with the social or the mechanical or the abstract. Some opportunities we come across click with our constitutions and set us along a path in life.

Of course, genes can't pull the levers of our behavior directly. But they affect the wiring and workings of the brain, and the brain is the seat of our drives, temperaments and patterns of thought.

The media and intelligentsia were partly complicit in Trump's depiction of the world as a dystopia headed for even greater disaster. 'Charge the cockpit or you die!' cried the pro-Trump intellectual right. 'I'd rather see the empire burn to the ground under Trump, opening up at least the possibility of radical change, than cruise on autopilot under Clinton,' said the pro-Trump left. When people believe that the world is heading off a cliff, they are receptive to the perennial appeal of demagogues: 'What do you have to lose?'

But if the media and intellectuals put events into statistical and historical context, rather than constantly crying 'crisis,' they would make it clearer what the answer to that question is. Revolutionary regimes from Nazi Germany and Maoist China to contemporary Venezuela show that people have a tremendous amount to lose when a charismatic leader forces a radical personal vision on a society. A modern liberal democracy is a precious achievement. Until the messiah comes, it will always have problems, but it's better to solve problems than to start a conflagration and hope for the best.

What could be more fundamental to our sense of meaning and purpose than a conception of whether the strivings of the human race over long stretches of time have left us better or worse off? How, in particular, are we to make sense of modernity—of the erosion of family, tribe, tradition, and religion by the forces of individualism, cosmopolitanism, reason, and science?

The actual organization of behavior goes on the level of the individual nerve cells and their connections, and we have a hundred billion nerve cells, probably a hundred trillion connections. It's just mind-boggling to think of all the different ways in which they're arranged in a baby's head.