Why Did Miami Declare a Curfew to Control Mayhem and Violence?

FORT LAUDERDALE HAD NO BIG PROBLEMS WITH SPRING BREAKERS:

 

 

BUT MIAMI BEACH HAD NOTHING BUT PROBLEMS. CAN YOU SPOT THE PROBLEM??  

(HINT, IT'S A TALE OF TWO POPULATIONS AND ONE INCOMPATIBLE "CULTURE" WITH PERSISTENTLY AND SIGNIFICANTLY LOWER AVERAGE INTELLIGENCE)