Each time the name of a new victim of police violence enters the public lexicon—Michael Brown, Sandra Bland, Eric Garner, Philando Castile, Breonna Taylor, George Floyd, and now Sonya Massey—there are questions about the officer’s response. How could that officer have mistaken a cellphone for a weapon? Why did that officer shoot someone who was running away? Did that officer really have to shoot so many times? One answer to all these questions is that officers are trained to see the world as threatening and to respond accordingly.