My childhood friend and next door neighbor to this day is out on medical retirement at 41 from the city PD after getting shot during a domestic call last year. He's 90% recovered. My son in law is a bit of a fast burner in another department. We often get together for beers and BBQ and in conversation, it becomes apparent the job changes them. They both started out with high ideals about our community, the nobility of the job, their duty to protect everyone, etc. The stories they tell make my job as an airline capt seem like the most dull job in the world. They see things I would consider horrific more days than not.
As a result, it seems that over time they lose trust in broader society and become more intensely protective over the people they care about. I would trust both of these dudes with my life. The percentage of people I encounter on a daily basis that have just stabbed their girlfriend is pretty low, while the percentage of people they encounter who have just sexually abused a family member or broke into a house high on meth is pretty high. We make generalizations about the rest of society given the data we have.
A local cop was shot a week or so ago. Every law enforcement officer within an 80 mile radius was on a personal mission to find the perp. They found him a couple days later, had a standoff in the backyard, and several officers mag-dumped on him. I was at a party last weekend with some cops and they were enthusiastically sharing pictures of the scene and the bad guy. It was unspoken, but obvious that everyone knew there was only one type of justice this guy was going to get. I was kind of unsettled by the idea that maybe none of the local law enforcement had any intent to take the guy alive while I was simultaneously glad that he wasn't.
I had often thought I'd be a good cop when watching these bad cop vids. After hearing the stories, I don't know that I could keep myself from treating a large swath of the society with suspicion, disdain, and contempt. We could always strive for improvement, but I'll never be convinced that you can expect human beings to do this job and not have any of them develop sociopathic tendencies towards parts of our population.