When I lived in Jacksonville I lived in a bad neighborhood that was getting nicer because of all the families and hipsters moving there (historical blah blah forget it), but it still had a
lot of crime. I really lived close to what I consider the worst neighborhood I've seen, which was called ... stuffsville. heres where it was on a map:

Just absolutely stuffty. No streetlights, houses had bars on their windows, doors busted down, cars with no wheels everywhere, pretty much a standard ghetto. But the only times we went there were at night and that was like twice. Once, because the highway that we used that passed it was closed. Twice, because I got off a flight at like midnight/1:30 and the exit was /still loving closed/ (it had been like two years since the closures began).
Scared the stuff out of me. I still go in there when I'm in Florida, because family lives in that area. NOT the same place. Near it. It's a nicer neighborhood but still ghetto and scary.
Closer to home, i heard gunshots all the time. My parents told me they were never gunshots, then told me they were when we moved away. My parents once ran outside at like 10:00 and I woke up with a nightmare. I freaked out. I was like 9. I found out recently that either someone got killed or raped on my block. Someone also kept stealing someone's firedog statue, and someone also robbed that same family at knifepoint. Neighborhood was stuff. A former addict lived across the street from me. I say former because I don't know if he still is or not, but he was a really nice guy anyways. There were also a forgetton of stray animals.
Great city, though.
It happens every second here. But a simple sack of 20 100ARS bills will save your ass. A paid assassin killed a drug dealer who owned money to another drugdealer with a war pistol cal .60 of high precision in the "safest" neighborhood of Buenos Aires.
Safest likely means higher income. Crime still happens in higher income areas because drug dealers have more money.