I don't know a lot about Justin's parents, but the fact that he turned out like this makes me think that he was raised pretty poorly. Looking at Wikipedia, his mother seems to have been pushing to get him into the music industry from an early age and was afraid of having Scooter Braun offer Bieber the job because he was Jewish and had to pray with her church elders to be convinced to let Braun become "his man."
That should be a bit telling as to how Bieber's life went. After that, it seems like Bieber spent most of his time with the celebrities and producers; mix a whacko (possibly fundie) mother with the majority of his teenage years being spent in the celebrity scene and you've got a recipe for disaster.