An elitist, academic argument at best.

Have any of your studies in the field noted that police officers, along with prosecutors and others involved in the criminal justice system often start with high moral and idealistic standards but as they deal with the lowest scum of society 24/7 and with the 'good' citizens only when they are drunk drivers, committing incest or pedophilia and otherwise at their worst, they tend to become insular and tend to only associate with their peers with the same experiences?  

 Do the Harvard or Northwestern articles below match your bias?

https://www.hks.harvard.edu/news-events/publications/impact-newsletter/archives/summer-2011/a-new-paradigm-for-policing-in-the-21st-century

http://scholarlycommons.law.northwestern.edu/cgi/viewcontent.cgi?article=7244&context=jclc