The expectation is not the implementation. It is the implementation that results in actual societal effects. As a rule, police do not prevent crimes. Potential victims do, when crimes are prevented. Police are basically tax gatherers, and the lack of understanding of their role does not matter societally, other than to those that would lick their boots anyway, just because cops are armed and have a badge.
The implementation is what is actually happening, and that is what actually impacts society. This is why I disagree that both are true and happening.
I object. Expectation already influences behavior, so it generates the implementation you are talking about. What does your experience tell you?
Did you have a fixed negative expectation in dealing with a person and what if that person behaved differently than you expected?
When did someone surprise you and are you open for such surprises, for the unexpected?
Like if you don't trust a child and its abilities and already classify its actions internally as failure, what influence do you think you have on the child? Will it notice that you distrust its abilities? Will he or she become more skillful or clumsy as a result? Will it still trust itself if it feels your distrust?
Surely you are already aware of the phenomenon of the observer influencing the observed object?
Don't you think that every person, every situation deserves to be treated anew as unexpected?
Which country do you live?
I come from Germany. I have made good experiences with police. They impressed me by staying calm and supportive during encounters where people freaked out.
I have often been very impudent and unfriendly towards the police. Once I was stopped during a night drive. Totally annoyed that I had to bring my boyfriend to work. I was driving unsteadily and made mistakes because I was tired. The police stopped me to check if everything was okay with me. I answered grumpy: "I don't know! I'm tired and annoyed and can't find my way home!" The policeman remained friendly and described the way home to me.
Another time I was stopped on a trip because I hadn't noticed that my back-lights had failed. One was already defective at the departure and the other one broke during the trip. I was still twenty kilometres away from home. Instead of shutting down my car, the police offered to escort me all the way home by driving behind me. I was totally relieved and grateful to have escaped all the stress of parking and repairing and picking up my car.
You have asked waaaay too many questions to answer one by one, so I will try to respond to your general point.
As a child I was feral. I was raised on an island in Alaska, and learned to forage for food due to neglect, and a love of nature and freedom. Unable to shake the lure of civilization, I was nonetheless dismayed by bullies, and such tendencies in society. When I was in my early teens all I wanted to do was party, so ended up in unsavory company.
I learned that a kilo of cocaine was being crowdfunded and a guy I knew was going to go get it. When he returned he died, and no one claimed to have found the cocaine. The police reported he committed suicide by shooting himself twice in the heart with a lever action rifle (the kind cowboys used). Suddenly the police were selling cocaine.
It is very difficult to shoot yourself in the heart with a rifle, and impossible to do so twice. I understood he had been murdered by the police in my little hometown so that they could steal his cocaine and sell it. No one that cared had the power to do anything about it.
This is not the result of my expectations, but of murder and corruption that is protected from prosecution because it is done by the police and government agents themselves. It is not a unique event, and a bit of research will reveal that kind of corruption in practically every jurisdiction in the world. Corruption is endemic in government, and the more powerful government is, the less ability civilians have to curtail it. A criminal intent on getting away with crimes will certainly be interested in being a cop, so that they won't be investigated for the crimes they commit.
While there may be individual police that aren't criminals, and the vast majority of acts undertaken by even the most nefarious criminal aren't criminal acts, as a rule cops are criminals, because that's what the system is designed to do. Government is a vector for corruption, first and foremost.
You might think that this cannot be, that a horrible murdering criminal could not be nice to kids and pets, but you are wrong to think so. It is demonstrable that Pablo Escobar was beloved in his hometown for donating to charity, helping poor people, and generally being a nice guy. He was a born politician (I think he even ran for office), and all the cops worked for him because he paid them more. Think about what this means in relation to rich philanthropists and smiling politicians shown on TV over and over doing nice things.
When you were driving home with a tail light out corrupt cops were nice to you. That doesn't mean that if they found a kilo of cocaine on the seat next to you when they pulled you over they would have been nice to you. It means you have no knowledge of corruption because you are not involved in it. Absence of evidence is not evidence of absence. Just because you haven't seen it doesn't mean it isn't real, especially if you're not looking for it.
When I was a kid cops gave me booze and cocaine. They were nice to me. That doesn't mean they weren't criminals, murderers, and drug dealing scumbags. I learned they wanted me to sell cocaine for them, so I left town. I don't like bullies, even if they're nice to me.
My expectations are subject to correction due to real world experiences. Things are what they are whether or not I want them to be that way. Wanting a thing does not make it be. In order to attain a goal, one has to do more than want. One has to act. If you want police to be escorts for sleepy, irritable drivers, then hire escorts and call them police. If you give a group of young men guns, and a commission to protect people from criminals, don't be surprised when criminals weasel their way into your group and commit crimes. Criminals aren't more stupid than the rest of us, and the smartest of them are those that pay government agents to commit crimes for them, rather than be cops themselves.
Hitler was nice to his dog Blondi, and Blondi loved him.
Blondi was not a Jew.
I said in the beginning: both is happening, so both is true.
Illusions are not real. They are not happening, even if the hallucinator believes they are.