I see one really,
really, really bad result of this study which is pretty much inevitable. When a cop shoots an innocent person he will, not might, not could, but will skate. He will almost certainly not be indicted. If he is the case will almost never come to trial. And if it does the defense will pull out all the "thin blue line" stops. The chance of him getting convicted of anything is about the same as the tissue paper dog will of chasing the asbestos cat through Hell. His career might suffer a setback. He might lose his job quietly. But he will not see jail time unless it was a hit for the Mob or similar. That's just the way it is.
This study
will be used in those few cases where a cop might be in danger of actually receiving justice. Friendly experts will cite it to show why it is important that police shoot first and don't bother to ask questions. Add it to "furtive movement" and "positional asphyxia" and "excited delerium". It won't work for you and me. It will work to make sure that Officer Friendly is never ever at risk of jail time or the needle as long as he wears a badge.
The whole "learning to kill" bit comes with a few cautions. It is certainly possible to learn to kill and not be destroyed psychologically. The complete disinhibition is more appropriate for soldiers. It is absolutely not appropriate for police officers. Their job is not to kill people. It is a possible contingency that they need to be prepared for, but it's not what they set out to do every day. They must not be trained or permitted to think of it as the default way of dealing with the public. If it is, then we will have to consider all cops, by default, to be barely socialized conditioned sociopaths and act accordingly. We're supposed to have law enforcement professionals, not Black and Tans or
Tonton Macoutes.
Second, soldiers are supposed to be in battle infrequently and eventually return to the normal civilian world. As it is, they have enough trouble doing so. The poverty rate for discharged soldiers is very high. 1/4 to 1/3 - according to the latest best figures - report clinically significant mental health problems. That's the result of no more than three of four years of disinhibition and living down the rabbit hole in an environment which is supposed to support them as functional. If you do the same thing to cops with a twenty or thirty year career you will - guaranteed no doubts about it - have police forces made up of pyschotically insane rabid dogs, the shell-shocked wounded, the disocciative and functional sociopaths.
Third, we don't have a ritual structure for bringing warriors back into the world. Other cultures do. The IDF does. After WWII the long voyages home served a similar purpose. The Apache and Navajo, the Dayak and others all do. We don't. You can be on patrol in Baghdad in the morning. The next day you're in Chicago with no gear, no gun, no buddies and a bunch of random people running around.
Fourth, if you keep soldiers, cops or anyone else like this for too long they simply will not be safe to be around. Even the best can break under long-term stress. We aren't Rome which had some legions that stayed on the frontiers forever. The US Army and Marine Corps are not the Foreign Legion. If you go for optimum killers among your soldiers, let alone your police you will have thousands or tens of thousands who will never, ever be fit to have around normal people. You will create a legion of exiles and monsters. Are you sure it's a good idea to make this a job requirement for law enforcement?