That's true of any city these days. I live in a semi-rural residential area that is overall pretty safe, but even so, I wouldn't take chances.
Moreover, I've stopped giving out stuff for Trick-or-Treat. Let it be known that whatever a kid might bring home, he/she didn't get it from my house, so if it turns out bad, it wasn't from me. That feels like crap, but it removes a non-zero risk.
It's a hell of a thing we've turned into.
For me, my faith now suggests that halloween is something best left alone.
What I see a lot of nowadays anyway is its just one more excuse for the adults to drink alcohol.
Case in point, one Halloween a pick-up parked in front of our house, let the kids out of the truck bed and all the parents stayed behind drinking beer......not much of a parenting example IMO.