So I sat through a class this week that has been given to all military personnel for the past through years, called Tactical Combat Casualty Care (TCCC). The course was being taken by a variety of students, including two cops, five paramedics, two paramedic students, six firemedics, and a prepper.
The instructor introduces the course, and says how topical and important it is, because of spree shooters, and how they present a great risk to rescuers. He then mentions that the recent shooting in New York, and holds it up as an example of why the course is so important.
So I pointed out to him that 10 of the 11 people shot in the incident were shot by the responders. He argued with me and told me how wrong I was, until another student backed me up. His comment at that point was "Oh well, casualties of war."
That is the mentality that is present in the police force, summed up in one conversation.