Societies attitudes are very persistent. Takes decades for things to materially change. The root of that is the Max Plank quote: A new scientific truth does not triumph by convincing its opponents and making them see the light, but rather its opponents eventually die, and a new generation grows up that is familiar with it.
That said I think juries are becoming much more aware of the implications of letting bad cops off the hook. Muni's are becoming tired of paying out settlements for cops that should have been long since fired. And this is in the contexts of increasing militarization of the police while the crime rate has been falling persistently for 30 years.
Things always look like they'll never change and then they do.