Good point, i agree with you on this. I would like to add that, It's not what you have growing up, as much as it is spending the quality time with your family. Leading by example has a lot to say for things. If families spend more time together, they are less apt to go astray. Many people think that the rich kid from school has it made, but the rich kid thinks everyone has it made.
Maybe the rich kids parents are working too much to make money, so they don't see him/her much, this causes resentment, and retaliation. That's my take on it anyway.