And by that statement, you are agreeing with him. His point is that since any cop "could" be bad, we must mentally prepare for that just like we prepare for anything else that is a possibility (no matter how small).
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That said I do not immediately jump to the conclusion that a cop is bad, just the same as I do not assume that the random stranger intends me harm. I am polite and respectful in both instances, but need to be prepared for any eventuality. It's the basis of situational awareness. If you let your guard down (mentally or physically) because you become complacent with any situation, you invite trouble.
And one consideration unique to dealing with police officers when they approach you to "investigate" something is this: by the time you discover that the police officer you are interacting with is "bad", you have likely already relinquished several of your rights that you could use in your defense should you end up in court. For example:
Police officer, "Hi! Can I talk to you for a few minutes?"
You, "Sure, officer."
Police officer, "We got a call that someone is scared because you are carrying a gun so we need to sort this out."
You, "No problem, officer, what do you need?"
Police officer, "Well, if I could see some ID, that would be a good start."
You, "Sure, I have nothing to hide, here is my driver's license."
Police officer, "OK, your name came back clean, but I am going to have to issue you a citation because you scared someone by carrying your gun, sign here, please. The fine is $400 or you can appear in court in two weeks."
You just consented to having a voluntary encounter with that police officer and gave up your very first defense in court: were you being legally detained? There is no illegal detention if you voluntarily stay of your own free will. Just like there are no illegal searches if you give your consent. Now it is up to you to prove that a reasonable person would feel like they had no choice but to interact with the officer and that is why you "consented" to the encounter. The mere act of walking up to you and asking to speak to you or even asking for your ID is not a detainment.
Police officer, "Hi! Can I talk to you for a few minutes?"
You, "Sure, officer."
Police officer, "We got a call that someone is scared because you are carrying a gun so we need to sort this out."
You, "Are you detaining me, officer?"
Police officer, "I have to investigate the 911 call."
You, "Am I free to leave, officer, I do not consent to this investigation."
Police officer, "No, you are not free to leave, I have to investigate the 911 call."
Now, your first defense in court will be to cause the officer to prove they had reasonable suspicion under which to lawfully detain you because you specifically expressed that you were not consenting to the encounter. If the 911 call contained no other information other than a description of a person engaged in a legal activity, and the officer saw nothing contrary to a person engaged in a legal activity, then there is no basis to legally detain you, for example, to check your identity and verify you were not a person prohibited from carrying a gun. If you can get the initial detention thrown out as having no reasonable suspicion to base it on, all charges after that arising from that detention must be nullified as well.