I don't believe that anyone goes out hoping someone gives them a reason to shoot someone just as most people who are in prison for murder never intended to kill someone but they reacted poorly to a situation and did what they did. Why do you think only one officer shot? The others didn't perceive him as a threat. After the situation all the officers have to come to a conclusion about what happened even if they don't necessarily agree. Imagine what happens to the officer around the station who says he didn't perceive a threat, how do you think he's going to be treated by the rest of the officers? If you don't go along with it that's committing career suicide and some of us like having a career.