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..
He fosters and encourages that behaviour.
I once saw a little interview with him where it was asked about the behaviour of some of his rabid fans on social media in regards to their treatment of other people on twitter who may express any form of criticism towards him.
His reply?......"Well they shouldn't mess with me".