To protect and serve who?
I believe it is tied in with the insecurities and inadequacies of many of the people who choose to become police officers, because then they feel they won't be pushed around or made fun of, because they have a gun and they can act tough. People who feel inadequate either drive giant trucks which serve no purpose, or they become police who serve no purpose. Drive fast, cut people off, & generally make yourself feel superior even though you have a tiny d***. Good luck with that.