The only way the song is bad is if the kids actually comprehend what the lyrics are. However if your kids understand what they mean they should be mature in listening to the song.This means tell them or trust them not to listen to the commercialism, but to enjoy the song and the lyrics don't mean anything. If your kids are mature enough they can listen to it and not go out into the world and do the stuff the song says. If your kids aren't mature enough though tell them they can listen to what they want if they take the music in a mature matter and not juvenille. Im 14 and i have been listening to this type of music since i was about 5 years of age. My mother thought i was mature enough to listen to it and i was and still am.
=)