So much news of death and destruction has poured into our collective consciousness over the last two weeks: the bombings in Istanbul, Dhaka and Baghdad, the killings of Philando Castile, Alton Sterling and five Dallas police officers. People are grieving, protesting, debating, watching with horror and apprehension. The prevalence of cameras in our daily lives means we now have the option to see violence and its aftermath in grim detail, and those images can linger in our mind