Those whose education on the use of force and the dynamics of a shooting incident is limited to the typical “western” movie or TV shows are indoctrinated to believe that shots in the back automatically make a shooting a bad shooting. The fact of the matter is that this simply isn’t the case.
I highly recommend the articles found at the following two links. They do an excellent job of explaining of how a good shooting just MAY result in shots to the back. This applies not only to peace officers but to armed citizens as well.