You need the proper training. You can review some of that training through right-to-know requests. You can also read The Tactical Edge. Many of the issues you see happen are because of incorrect or insufficient training. There can be an us-vs-them if it's not done right.

Also, the threat on a traffic stop is not to be dismissed - there are officers attacked during those stops. Those stops are not just for traffic violations, but can also happen if the vehicle matches one used in a crime or reported stolen. Do you really want to be unarmed when making traffic stops or other calls? Sometimes they may stop, not to yield to authority, but to ambush the officer so they can get away without being identified.