HOW DO YOU MEASURE SECURITY AND RISK IN USA CITIES IN COMPARISON WITH CITIES IN OTHER COUNTRIES.?

MANY PEOPLE AND MEDIA OUTLETS CONSIDER THE US AS A SAFE AND LOW RISK COUNTRY FOR CITIZENS OR VISITORS BUT CITIES LIKE OAKLAND, CA OR MIAMI FL. CAN BE AS RISKY AS CITIES IN MEXICO OR CENTRAL AMERICA, HOW TO MEASURE BETTER THE LEVEL O RISK OF USA CITIES WHERE CRIME AND GANGS HAVE HIGH RATE AND ACTIVITY.