As part of my job I interact with local cops fairly regularly. I have not noticed that they go out of their way to "wrongfully charge people with crimes." They often don't cut people slack in enforcing the law, but that's very different. That's just my experience.
Personal experience is very dependent upon who one is,
& the circumstances of interaction. When not in "cop mode"
during an interaction, we don't see what they're like when
on the job, fearful, in a bad mood, or predatory.
My experience with cops is varied. I've hired several in my
business, & found most to be fine people. (There's a separate
thread about a violent lout I fired.) But as their employer,
I'd not see the cop side of them.
I've also interacted with cops on the job in the course of business.
Some have been OK, but most have been hostile & imperious
asked to do things, eg, stop blocking my parking lots so that
customers can come & go. They sure do resent a lowly civilian
trying to get them to cooperate. More such stories indicate that
they are definitely of the "serve & protect" mindset.
You know me....middle class, white, basic people skills, & living
in a low crime area. But if one is neuro-divergent, deaf, blind,
black, Indian, foreign, or living in the wrong area, one's experience
is likely to be very different from mine.
As far as other cops intervening when when a cop behaves badly, it seems to me that could get very messy if it became a norm, particularly in the kinds of spur-of-the-moment, high stress, dangerous situations when cops are often criticized for bad behavior.
Some local governments have legislated requiring intervention
by a cop who sees wrongdoing. Messy it could be, but we
should not tolerate cops illegally assaulting & robbing civilians.
Imagine cops fighting each other while a suspect resisting arrest is able to escape. It's a nice-sounding idea in principle, but in practice it's more complicated.
A hypothetical scenario doesn't justify cops standing down
when another is doing wrong. The real world shows us
examples where the supposedly good cops could stop
wrongdoing, but chose not to.
They should serve the public, not treat us as the enemy.