Well... I think there was some exaggeration in your description of supervision, but I must say that I will never really understand where you're coming from on this topic. I'm just not sure how - you don't associate children with supervision? That's.... I don't know. It's not unthought of to think your children need a certain amount of supervision for their own safety. I know Australia is far away, but it's not a different planet and I'm pretty sure it's inhabited with humans so I don't think most parents here think too differently than most parents there. We are not talking about watching their every move, and the difference between a kid and a young adult is that a young adult has the mental capabilities to make good decisions based upon the ones you made for them when they were too young to know better. Kids aren't capable of doing that, otherwise they'd be out getting a job and making families at twelve. And they'd be driving cars as soon as their feet could reach the peddles, and they'd be buying cigarettes when they were in for a candy bar at 10, and they'd be at the bar having a beer with the guys at 12. Does that sound silly to you? Well that's why it's illegal up to a certain age. Kids need their limits until they can follow them on their own. We do our best to guide them until they are adults and then they use what they have seen us do to figure it out on their own.
Just because we're making sure our kids are safe on the internet doesn't mean we're sitting in the back of the class at school or hanging out on the couch with them when they're at their friends house, or following them to the movies, or tracing their phone calls or reading their text messages or emails, or blocking everything but Noggin on TV, or tasting their pie before they get to eat it at McDonalds. There's a difference between supervision and overprotective/overbearing. I just don't think you can see the line. Certain things are required to be supervised with your kids because it's your job as a parent to shape them into good people. Believe it or not, they're not born with the instinct to do the right thing. That's why my son pulled the dust container off of the vacuum today and dumped all the dirt on the floor and laughed. He doesn't know better, and it's my job to tell him not to and to watch him to make sure he doesn't do it. Same goes for teens, but different stuff. There's things they think are fun, but they don't really know that certain things have the potential to really hurt them. I will keep an eye on those things, not a super freakishly strict eye, but a casual eye anyway. There's nothing wrong with that, in fact it's completely normal and highly approved of by most.