It's weird, I don't think you can pinpoint one thing or another, I think its more a change in times than anything.
When I was growing up (we'll say middle school / high school times, 90-98) my parents both worked and werent home until around 6 everyday, so they weren't super involved with me. Hell I think we only ate dinner together a couple times a week because I was usually out and about wanting to play sports or whatever else.
My friends and I always had shit to do. It didnt take community events and ymcas and all this other shit to give us something to do either. The only real thing offered to us relatively close that we could realistically do every day was an arcade, and that cost money so it was more of a once or twice a week we'd head there for a bit.
So what did we do? All kinds of shit. We'd drag out the basketball goals into the culdesac and run full court ball, or play baseball in the culdesac or at the local park. We'd ride bikes, we'd play video games, we'd drag out my buddy's dad's old vhs camcorder and make movies. Sometimes we'd go exploring in the woods. Every now and then we'd get real daring and ride bikes ten miles to the dollar theater.
The only thing that really changed into highschool was a couple of us would get stoned while doing these activities, or we'd just hang out at someones house or on their porch and bs, other than that we were good kids who didnt have any problems in the neighborhood.
I really think it's just a changing mentality, and the environment. It's easy to blame the parents, but you can take people from area and people from another area whose parents have the same amount of involvement and end up with varying behaviors. You throw in the youtube element, people having an audience and learning from others because they can now see so many other people doing crazy shit, and it really just becomes a matter of people and times changing.
I'm sure 15 years ago, people our age now were saying the same shit.