When I grew up in the 70s, I walked to school by myself (well, usually in a group of neighborhood kids from my street) in kindergarten, walked back home after school, and had a key to let myself back into the house to wait for the rest of the family to come home (I lived with my mom, grandmother, aunt and uncle until I was 7 and my parents reconciled and got married). By about 8 I was able to take a PAT bus by myself (making connections downtown) from Hazelwood to the North Side out by Riverview park to see my grandmother. I used to take the bus downtown and go to the movie theater at the Bank or on Sixth St. near Duquesne Blvd. all the time when I was 10. I went with friends, by ourselves, to see Pirates and Penguins games. When I was a kid, and I went outside to play, I would get on my bike, meet up with my friends, and we could literally be MILES away from home, ALL DAY, with no way for my parents to know where I was. The only time that was a cause for alarm was if we didn't get our ***** home in time for dinner.
I realize that not all children are capable of handling the responsibility, but I don't know what has really changed in the world that makes it less safe for kids now than it was when I was that age. I don't think people are preying on children any more now than they were 30 years ago. It's not that the world is less safe, but that children are kept more sheltered.