To me that just sounds like a huge excuse for cops who are rarely ever shot at in real life. The majority of cops never even have a reason to draw or fire their gun their entire career. Being a cop isn't even a very dangerous job, and all but a handful of cop injuries on the job are due to car crashes that they themselves initiated. A random residential framer has a far higher chance of injury and death than cops in even known dangerous and highly criminal areas.

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.