While I was a youngster I had numerous run ins with the local cops. Nothing serious, but I remember feeling mistreated, literally manhandled by the officers to this day.
Tangentially, the town I grew up in is not typically thought of as violent, but several folks in my high school class were violently murdered over the years. We've also had the misfortune to experience a few other heinous crimes which don't deserve to be repeated in polite company.
The local police basically failed, but a few years ago the county sheriffs took over.
Whereas, as a youngster I had numerous bad encounters with local authorities, now the sheriffs wave to me when I drive through town and I see them with the local kids working more like local cops.
I've never been a fan of the police, but this has been a welcome change in my community. I realize the visibility of age can change your relationship with authority but I think there was a cultural change as well.
Now, on the other hand, I'm also painfully aware of the shenanigans that police pull all over the US. The incidents of police brutality are too numerous to mention, and the justice dispensed is a pitiable counterweight (I'm referring to the prosecution of police brutality, not the justice of the police action, for clarity's sake).
I think there are too many weapons in America in general, and the militarization of the police is just another example of that. There's always the part of this argument where someone yells "but why can we see people getting shot on the television but we can't see sex?".
I think the militarization of the police has become a part of American culture and that my experience with my local authorities is an outlier. I wish the culture of our police was based around community development and not militarization.