What did they do to earn that trust?
The concept that one class of humans is the "punishers" who are teaching the other class(es) underlies most (if not all) fascist/authoritarian/racist ideologies of the last 3 centuries.
Of course you don't see what's wrong with punishing behavior that has been deemed unacceptable by society. Unfortunately, behavior that society is largely OK with (e.g. drug use) is punished nontheless - unfortunately, society can (and has often been) quite wrong about what should be punished (homosexuality, female sexuality, prostitution, sexual "perversion," drug & alcohol use, to name a few).
The fact is that the kid involved in this story didn't do anything "wrong" that could be easily trained out of him. Probably he has a whole set of complicated complexes of problems. For instance, one thing that many people in the US and UK (and other places) seem to suffer from is sexual/touch deprivation. Maybe if the kid were getting laid instead of playing on his laptop he wouldn't have engaged in such weirdo behaviors. I'm just sayin' - legalize drugs and prostitution and 99% of these problems go away.