The Qur'an is no more violent (or sensible) than the Judeo-Christian scriptures. I believe the violence perpetuated by self-proclaimed Muslims today is more affected by perceived cultural and political grievances than anything directly associated with Islamic belief. It's inextricably linked to the dissolution of the Ottoman empire following World War I, European nationalism, the arbitrary divisions created by Western colonialists, and the subsequent and frequent interventions of the West into Middle East politics. If we are going to term any country or its people Muslim and overwhelmingly ascribe their conflicts to their religious beliefs, we must also do the same for nations that are predominantly Jewish, Christian, or secular, and those latter have far more human blood to account for.
He who loves God cannot endeavour that God should love him in return - Baruch Spinoza