What Simon said!
As a non jw I can tell you most people do not give a thought to the historical beginnings of Halloween. When I was a kid we went at night and our parents never came with us. How weird would that have been? would have spoiled all our fun in our minds. As soon as it got dark we hit the neighborhood, the boys would even go as far as the next subdivision and would get home late. I think it officially ended at 10.
When my kids were little trick or treat was in the day time and all the parents went with the kids. Later they returned it to night time. Our school had a dress up 'book character' day (they had to read the book & report on it) right before Halloween so that was usually the kids Halloween costume as well. Not sure what the jw kids did for book character day as the jw's were not on my radar at that time. I wonder if the jw kids got to dress up for book character day? I think they probably started it because of jw's come to think of it, sounds pc enough.
Many families around here do a smaller area of trick or treat and go back to someone's house for kids party & food and adult beverages for the parents. Nice way to meet all the kids parents.
As for so much candy, the parent still has control of how much a kid can eat at any one time. Around here a dentist is offering kids 1.00 per pound of candy and will be sending it overseas to Military.
The costumes; I agree some are overtly sexual in some cases. I always made my kids costumes as did my mom. Old bridesmaids dresses did indeed get a second wearing in my house! lol