Sheema Khan is the author of Of Hockey and Hijab: Reflections of a Canadian Muslim Woman. Two summers ago, shortly after details emerged about the heinous murder of four members of the Afzaal family in London, Ont., I found myself noting the plethora of pickup trucks in my suburban neighbourhood. Rather than taking walks near my home, I drove to a nearby park, where I thought it would be safer to stroll. But even during a short walk through the parking lot, I was vigilant about cars circulating nearby. This is what fear does to you. The instinct to survive...