You mean in the U.S.? I honestly don't know if it more
dangerous now than when I was a kid. I do know that kids are generally less free to roam around their own hometown without parental supervision than they used to be, something multiple other people have remarked upon elsewhere in this same discussion.
I used to play in the patch of woods behind my house. So did all the neighbor kids. Sometimes, a bunch of kids would get together and build an earthen dam across the creek. My dad would call us home using a hunting horn. I went where I wanted in my neighborhood. My parents knew where I was, generally, but that didn't mean they could readily physically locate me. So they called us home with the horn, which we could hear anywhere in the woods.
That kind of thing would get social services called on you today.