Today, strong currents of thought encourage us not to have empathy for people we disagree with. But empathy leads to clarity.

From the United States to Sweden, immigration has become the Western world’s biggest political fault line, dividing societies and fueling anger and mistrust. That fault line runs directly through Tam Hussein.

Mr. Hussein is Swedish, born and raised in a suburb of Stockholm, and like many Swedes, he has looked on the changes in his homeland during the past 10 years with shock.

Organized crime and gun violence exploded after the country took in some 160,000 migrants in 2015, and he says he sometimes has trouble fathoming how much his country has changed. “When I grew up, there was hardly any crime apart from bicycle-stealing, and that was scandalous,” he says. “Whe

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