Where is the border line?

Two weeks ago one Saturday me and Mr.B went to Amsterdam and this time not for a museum or a special event but only to get more familiar with the atmosphere of the city itself. This city has its own character as The Hague (Den Haag), Rotterdam and just recently visited city Maastricht have, each has its own personality and this tells you no matter how small the country is still things get different when you move from one city to another.
Anyway, at the end of the day we went to "red light district", I was too curious to skip seeing those streets which until then I always thought it was "red line strict" (Being an Iranian does explain that I guess :). It's needless to say this area and the banned-free access to Marijuana in certain cafes have made Holland "the" place to visit for certain tourists.
Apparently this doesn't sound as appealing to the Dutch people themselves. I heard once from one of my supervisors that this policy is coming from this mentality of Dutch which says: " You're free to do whatever you want as long as it doesn't hurt anyone else" and that they want to have control on the issues which have become underground problems for other countries BUT, that's not as clever as it sounds to many Dutch people and they're not really happy with that. They're having problems with under legal age prostitution and the number of teenagers with tendency to smoking cigarette and later on Marijuana has increased-as they say.
It's hard to say if it's really serious especially in the world of relativity with universal problems like addiction and so on, it's better be not too judgmental maybe.
But apart from the whole matter there was one scene I took when I left that red district. Two 11-12 (if not less) years old boys were walking in the area looking at the windows, giggling and whispering. I wonder when they got back to their homes what they said to their parents if they were asked where they had been to.
Isn't it similar to the right and responsibility that parents should have to control the TV channels when they have "kids" and if so who is taking this right from them. Does that famous Dutch mentality of "not my business unless you're bothering" have anything to say for such families?