There has never been a better time to be alive. So why are people so sad?

It’s tempting if you are a liberal, as I am, to blame much of the malaise of life on Donald Trump. And he certainly deserves his fair share of blame, but not all of it. The reason it’s tempting is because it’s easy and straightforward. But the elements that allowed Donald Trump to act as an accelerant say things about our society and about our brains an…