Cops can and will use every kind of deception they can think of to find evidence of a wrongdoing, even ones the person didn't know they were committing.
But 99% aren't looking to invent wrongdoing just for the sake of arresting someone.
Sometimes, the old "if you didn't do anything wrong, you have nothing to fear" adage is really true. Cops may or may not be constantly looking for wrongdoing, but they ARE looking for REAL wrongdoing. They do have to fill out paperwork build cases, log evidence, conduct interviews, go to court, etc. They don't just pull someone over, make up false crimes just for the joy of arresting someone. Cops are just normal guys doing a job.
If a cop speaks to me, I truly don't worry. I KNOW I didn't do anything wrong. And I know that it's not worth it to either of us or anyone else for him to invent crimes that I supposedly did.
It boils down to a fundamental difference in how we see the
people who decide to be cops. Your side sees them as the type of people who get off on power trips, who have fun lording over others, and who see themselves as better.
I see cops as average guys who felt compelled to do a thankless job that needs to be done. They don't want things to be any harder or time consuming, just like a guy on any other job. They're just trying to do what they need to do to get the job done and go home without bullet holes in them.
And your side is just like the antis. You're using a paranoid emotional response to paint an entire group based off the misconduct of a widely publicized few. My side just looks at them like people, and doesn't hold anything against the individuals that the individual did not do.