I don't think the problem is so much that flashbangs are being thrown, as that they are thrown when storming the house of someone committing the grave crime of illegally selling nachos.
Not only a raid with flashbangs. They also tried to take an old lady's house for selling Nachos.
"Afterward, the city of Little Rock sued Harris, alleging that her property should be declared a nuisance and “abated” — or razed — since it was being used to facilitate criminal violations."