Correct me if I’m wrong, but it sounds like you lived in one of the more crime-ridden parts of SF (Tenderloin/SoMa/Mid-Market/Mission) while living in a relatively good neighborhood in Medellin (estrato 4 or above from my limited research). If that’s the case, I don’t see how that’s a fair comparison.
And you’re right - I can’t say for sure what Medellin is like because I’ve never been there.