evidence: Donald Trump has made the issue of crime a cornerstone of his campaign. He says violence in America is out of control and rising. [...] But several years of national data tell the opposite story: Crime is falling in cities and towns across the United States. NBC News recently spent a day with Detroit police, who say Trump’s characterization is false. [...] Some experts say the victim survey results for those years may be suspect, since they don’t reflect the increases seen in the FBI data. But Trump uses these low 2020 and 2021 victim survey numbers, despite the doubts cast on them, to argue that violent crime has spiked significantly during the Biden-Harris administration.