If the allegation is true, I'm not seeking to excuse Bieber's behaviour. However, [imho], it seems like 19 year old JB is cracking up under the pressure of being the object of obsession for zillions of tweens. Plus: news of the recent death threats/kidnap plot can't be helping..
Joss Stone had two guys who were on their way to her home, armed and ready to kill her. Yet I don't see her turning up hours late to concerts, throwing tantrums in restaurants, lashing out at the paparazzi, spitting at her neighbours and threatening them.
There are no excuses for his behavoir. He is just a dick who needs to grow up and start acting like a man.