There is a bit of a distinction to that final statement and one that they make very clear to people taking CCW courses. The police carry to protect themselves and others. The private citizen OTOH carries to protect himself [and those near and dear to him]. Private citizens are under no obligation to become involved in a crime scene other than as a good witness, they may choose to become involved if they believe that someone's life is in danger. Police are obligated to become involved, even if it puts them in personal danger.