An Aurora police officer, Daniel Bertelson, sent a department-wide email this month as he announced his retirement, offering some barbs and harsh assessments of the current climate for law enforcement. “I am leaving Colorado for palm trees and less communism,” wrote Bertelson, who spent 16 years with the Aurora Police Department. “Try to ignore the politicians and media,” he wrote to his colleagues. “They know nothing of this profession or honor; they’re self-serving con artists, well-dressed pimps and prostitutes at best.” The number of officers leaving APD has been increasing in recent years, jumping more than 60% from 2019 to...