the number of westerners killed by terrorists has grown of late, thanks largely to attacks in Brussels, Paris, Istanbul and Nice related to the self-described Islamic State, Still, the threat remains objectively small. compared to major causes of death in the United States, Europe and Canada, terrorism's risk is negligible; lighting kills more people most years. And measured in attacks or fatalities, the threat remains limited compared to what western nations experienced in the late 20th century. Moreover, the vast majority of terrorism's victims more than 99 percent in 2015