It's not for a lack of trying. A woman tried to kill accused rapist, Officer Jackie Neal, but only managed to shoot him in the neck. She should have read some of our hunting threads
Quick numbers. In 2008 765,000 Sworn officers (can make arrests). Average 32 deaths per year, your chance of being killed is statistically insignificant (while being personally excessive). Your chance of being spit on or other non-life threatening assault, is significantly higher.
From the Officer Down Memorial PageSo 27 in 2013 and 39 in 2014 are statistical outliers?
From the Officer Down Memorial Page
https://www.odmp.org/search/year?year=2013
114 killed in 2013
https://www.odmp.org/search/year?year=2013
127 killed in 2014
Again, Not sure where you're getting your numbers from, but they are wrong.
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