The police aren't responsible for any of that, they take their orders from the Mayor, and whoever controls politics. Look at Sanctuary Cities; most police officers don't agree with the idea that illegals should be allowed to commit crimes without facing deportation, but they are obliged to support the political power that mandates how they're allowed to do their job.
No one goes to jail for a roach in 2017. Even the strictest PD would only write a citation for that. People in poorer neighborhoods won't talk to police because that's the culture- talking to the police can result in retribution.
Again, politicians set the criteria, and highway patrol officers have to enforce it, then they receive all of the backlash, and have to deal with repercussions if they don't write tickets. Meanwhile, those that create the policy are given a free pass.
I really think society has changed, but the police haven't. Self responsibilty isn't a high priority for some people anymore. If someone breaks the law, and then complains that it's the police's fault because they were caught, I'm not really prone to care much. If the police abuse their power, then yes they need to be punished, but I just don't see it occurring to the degree that people are claiming.