When I was a kid, in my suburban Missouri town, Halloween Night was noted for pranks and minor vandalism. Rolling trash cans down the hill, TP on houses and minor stuff like that.
The tradition was to line up all the school buses on High School Hill and Mr Miller, the head janitor, who lived in a caretaker's house with his family, would guard them with a shotgun said to be filled with rock salt. No one messed with the school buses, so far as I know. No one ever actually saw Miller out there with the buses, either. His family consisted of his wife and his four daughters, all of whom were immensely overweight, three of them spent their lives in wheelchairs.
The women made sticky cinnamon rolls and sold them for a dime. They were huge and really tasty and outsold all the candy machines. I imagine that one of them had around 800 calories at least. The official story was that the obesity problem was caused by a thyroid problem, but I have a feeling that the cinnamon rolls had a lot to do with it as well.
I don't think that vandalism would have ever gone further than flattened tires and soap on the windows: certainly no gun violence.