C’mon !! Everytime there is a shooting, robbery, or any other violent crime, the police and everyone else, including Operah tell you to call the police and not worry about being embarassed for jumping to conclusions. They all say its better to be safe than sorry.
Suppose these guys pulled out a gun and the store manager later said they were acting suspicious but he didnt want to take action because he worried about being labeled a racist. He clearly did the right thing not only for himself but his fellow workers and the customers.