I was once calling the police because there was a guy screaming loudly in front of my apartment building.
He was not threatening, just really confused, was obviously looking for his home, I had the impression he was autistic or on some kind of spectrum and it was below -5C - cold enough that it’s really dangerous to fall asleep outside.
I called the police because I thought he just needed help and someone to look after him to take him home.
Yes, I do trust police in my country.
From what I can see from an EU perspective: The training you get to become an officer in the US seems to vary a lot between places. That explains lot of differences.
Also it’s quite short IMO. Here in Germany it takes 2 1/2 years to become a policeman, 6 Months of these as a trainee. And still we have a number of problems.