I’m not saying cops are always free of fault, and yes, some are trigger happy goons. But in an environment that affords close to zero reaction time, it is no surprise that cops are trained the way they are, and behave the way they do. Indeed, they are not in danger most of the time. But when they are, they have close to no time to think about it. As a result, it is in the interest of their own well being to assume that all situations are dangerous and to act accordingly.