We have seen in recent years an increase in police involved shootings with innocent individuals. This lead me to believe that policemen kill too many people, and simply call it a justified homicide. There is no way to determine when the police are right or wrong in many of these cases without witnesses.
No, policemen do not kill too many people, because police are trained in defensive tactics, and usually only use force when it is necessary. The incidents of law enforcement homicide are quite rare, considering the number of contacts that law enforcement has with the public. The incidents that happen are reviewed thoroughly to make sure law enforcement acted properly.