Maybe not.  Could be some of them are trained to handle dynamic situations.  I believe there's an ex-military guy back east (Massachusetts) who's re-training the police there because they were experiencing a bunch of incidents where cops were over-reacting.  I heard an interview and he said that the typical cop courses are more about protecting oneself and subduing the person than minimizing and diffusing the situation, as well as how to react in these "dynamic" situations.  Supposedly his re-training program is thought to be successful.