Here's another contributing factor, the amount of cops that our government spent large amounts of money training to be gunslingers.
"So it's natural that many military veterans seek employment in police ranks when they rejoin the civilian workforce. That's what is happening right now in numbers unseen since the closing days of the Vietnam War. The result is a job market flooded with well-qualified police officer candidates who served in Iraq and Afghanistan."
Military Vets Joining Law Enforcement - Article - POLICE Magazine
Guess how trained combat vets might handle many situations. Plus the whole gung-ho attitude that they bring to a police department, "us vs them"