Because when anyone else reports a crime, bad things tend to happen [at a statistically higher rate]. Everyone suffers, including you. Or maybe nothing happens

Because when anyone else reports a crime, bad things tend to happen [at a statistically higher rate]. Everyone suffers, including you. Or maybe nothing happens at all because first responders don't get there fast enough, or they choose not to do anything once they arrive. Or maybe they do the right thing, and you (or your family) suffer when the guy you called the cops on comes back and kicks your ass, or breaks your sister's leg. Last on the list of possible outcomes is that the cops stop the "bad guy" and everyone is hunky dory. Contrast that to the white/middle class historical experience of police being generally helpful and protective. Middle class white people call the police (predominately other middle class white people), and good things happen. Then they wonder why everyone doesn't just call the police when they need some help. That's privilege.