In a minivan with the rear seats ripped out, John is chasing one of his 250 electric scooters down a California highway. He finds it 10 miles away, hiding in a bush—a run-and-dump tactic that he says thieves use to test whether anyone will come after them before they take …

Shortly after a massive fire under the Interstate 10 freeway in downtown Los Angeles last weekend closed a 1-mile stretch normally traversed by 300,000 vehicles daily, California’s fire marshal announced that it was being investigated as possible arson. Some locals have been eager to blame the homeless encampments that are …