How about "people openly flaunting assault weapons"? As someone who lived in Rio most of their life, I think that's a good line to draw. Opinions filled with "human rights" concerns from people far removed are probably ethically and morally correct, which is... cute.
We're fighting an Urban War over here. This is a Concrete Jungle. This is a crazy post-apocalyptic situation to which most people in Rio grew accustomed to while most people outside Rio can barely picture.
As a police officer once told my wife as she was leaving her house in Rocinha and stopped to be patted down and inquired why was she being selected:
– Mam, do you know where you are? You are not in in Los Angeles. You are not in Paris.
My moral qualms went out the window around the same time my grandmother was murdered by being thrown off a bridge in Aterro do Flamengo.