OK, fine. Everybody errs sometimes.
I can indeed figure out how this happened; prejudices.
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regarding warning shots

According to Germany's Der Spiegel, German police shot only 85 bullets in all of 2011, a stark reminder that not every country is as gun-crazy as the U.S. of A. As Boing Boing translates, most of those shots weren't even aimed anyone: "49 warning shots, 36 shots on suspects. 15 persons were injured, 6 were killed."
http://www.theatlanticwire.com/globa...le-2011/52162/

That's competence, not an "invitation to criminally negligent homocide".
Supposing people should go for the kill with the first shot (or salvo) is such a thing instead.