To add to Ken’s post. ^^^
Being a mother of teens is an education unto itself.
We lived in a small community, a village, big enough to have a police department, but nowhere near a city. One evening (ahem) the police came to our door
with our teen who had been at a barn party we knew nothing about. Evidently, it was a fire hazard, i believe it. The entire high school might have been there, i don’t know.
Nothing happened, aside from the safe delivery home of our teen. We were speechless and humiliated, but, again, thankful it wasn’t anything worse.
In the moment, i don’t recall what i said, but i remember the officer saying,
“If they are teens, they are lying.” 
i was pretty shocked at such a jaded generalization .. but, when i thot a moment about HIS pov, i decided i could accept his observation as “generally true.”
This particular small town, i thought, had pretty good police who attempted to be peace keepers more than aggressive law enforcers. Our teen could have gotten worse than a safe ride home.
Police have a challenge of not becoming overly jaded in their work. Not everyone is suited. Some have to take breaks, or even find alternative work.
They have to be prepared to deal with the most docile people to the most violent, with every call. They never know what mix will meet them.
i think they can be pretty certain many people, innocent or not, will be afraid, and will attempt to protect themselves and others for that reason, if not for worse reasons. it’s part of the job.
Then courts+judges have to sort things out later.