Muslim mobs do this because no one stops them. They lash out in irrational violence because everywhere the world over, even in the West, non-Muslim authorities take it for granted that the proper response to irrational Muslim violence is to remove the occasion of offense to Muslims. If Muslims want to kill you for tearing the pages of the Qur’an, you must not tear the pages of the Qur’an. If Muslims want to kill you for drawing cartoons of Muhammad, you must not draw cartoons of Muhammad. And so the next time Muslims want you to stop doing something, they will just threaten to kill you for that, too. And the West will willingly surrender yet again. No one dares say to Muslims, Stop being crazy. Stop rioting over a book being torn when there are literally billions of other copies. Stop killing people over cartoons, and understand the importance of the freedom of speech for a free society. And if you won’t stop, we will stop you.

No one dares.

“Punjab town tense after torn pages of Quran found, over 250 booked,” by Raakhi Jagga, Indian Express, June 26, 2016: