Have you dealt with their parents? This is not always the case -- it's a different world and they don't have to work for much. That ole saying the apple doesn't fall far from the tree is true - so sad. Disrespectful - no ethics re/others property or as human beings. Irresponsible, untrustworthy, oh my. I can't imagine a child turning out like many do and I blame the parents/caregivers, babysitters, whatever they are. For some reason, people think they have to be aggressive to exist. I don't mean assertive for their own rights and properties, but animal-like aggressive.
The last thing parents want is for little Johnny or Susie to have responsibilities and have to work for something like they did. It seems to be normal.