The problem is, why should they be interested. It makes little difference to them (the mass of hoodie types that sadly make up a high percentage of Britians (and perhaps others) youth). Also, they are over protected, teachers, by means of a example, can do very little to restrain them. Thus growing up in a life where they are their own masters; makes them unruly and it is this system which is responsible for the general immaturity of young people throughout the country.
P.S. I say this being a teenager, myself, so unbiased in respect to that.