Thats awful! Did you manage to get a glimpse of the rotten thief? If so try and track him down....
I agree, all teenagers should be more disciplined and do some army training. It makes me sick when I see kids being disrespectful to adults, in schools kids even spit at their teachers.
This is where I believe the west isn't civilised and we should be more like other countries e.g. india, where kids know what manners are.