You are right, they are not out betters. As for the actions of Philadelphia criminals being irrelevant to innocent people- The actions of any of us, cops included, hold relevance in how the rest of us operate. Whether the police officer is walking into a donut shop to check on recent burglaries or pulling over someone for speeding, he/she is not blessed with the gift of immediately knowing who is a criminal/natural born killer and who is an innocent/average joe.
True. But when they are on revenue patrol, they have a general idea they are not in danger.