Amid violence and unrest, can Trump win with promise to restore safety and order?

Portland, Seattle, Chicago, Minneapolis/St. Paul, New York, and other major cities are experiencing a breakdown of order — violence and conflict that is a mixture of left-wing revolution, racial unrest, and old-fashioned crime. Whatever else they might have in common, all are governed by progressive Democrats, and all owe their current disorder in some part to the failure of progressive Democratic policies on the issue of public safety.

That should be an advantage for a Republican president running for reelection. What is unclear is whether President Trump can make it...