I watched it and I'm a fan.
You don't walk out of a concert with how many people ? 5k ? 10k ? Because of a few crazy fans on the front.
As simple as that. Unless someone actually threw something and injured him etc. Yes, he is also a human being. But as a celebrity, public figure, artist and so on he knows the price. Like.. when so many people spend their lives stanning for you and obsess and make you rich.... at least try not to be rude and yeah sometimes it will be hard, but that's why you are Justin Bieber.... that's why you have 200M networth ..... I mean..