Trick-or-treating is definitely not the same here, as when I was a kid.
First, I grew up out in a township, not a city, and Halloween was on Halloween, not on the Friday or Saturday before the 31st, or worse, after real Halloween. It didn't matter where the holiday fell during the week, Halloween was on Halloween. And Mischief Night was the night before, though since we weren't allowed out on Mischief Night, we took supplies with us on Halloween.
Second, it was after sundown, not at 5PM. How scary is broad daylight?
When I moved to Bethlehem, I was introduced to the modern urban custom of the city council deciding when Halloween would be, including any Halloween parade. Trick-or-treating is usually set for the Friday before the actual holiday, and parades are set for the Saturday before, in the early afternoon. And while I still had a communte, I would pass groups of parents with their kids out between 5PM and 6PM, walking them up and down the block.
As far as psychos go, sure, that's always a danger, but in town, I think you're more likely to get shot by a gangbanger than have some creep hand out poison.
My favorite Halloween was when I was in high school. I played trumpet in the marching band, and homecoming and our game against our biggest rival fell at the end of October. When I was a junior, that was on Halloween, and it was an away game. While we were waiting for the trucks to load up and board the buses, we went trick-or-treating, in uniform, to the homes adjacent to our school. When we knocked and people asked who we were supposed to be, we just said, "We're the band!"