What rubbish . It had nothing to do with London and hence him leaving and then cancelling two shows in Lisbon . Justin's problems are a lot deeper than "London" . It is a complete cop out to blame the location and not Justin .
The pap was doing the old Ray Winstone "I'm from Laaaaandaaaarn, I'll have YA!!!" routine. It wouldn't happen anywhere else. He was looking for a reaction and successfully provoked one. No doubt if Bieber touched him, he would have sued for emotional distress, or some other similar bollocks.
The only blame Bieber gets is rising to the bait.