Let's party like it's 1938, wohoo!

http://www.theguardian.com/world/2015/aug/23/german-neo-nazi-protesters-clash-with-police-at-new-migrant-shelter

Police in Saxony is pretty much in cahoots with those Nazis, we learned that much from the investigation surrounding the NSU terror cell.

And here's the interesting thing: you feel the need to show that good cops exist, to remind people of that.
If I wanna see a good cop, I walk into the local police station. These men and women aren't all perfect but I'm pretty sure in a conflict, they wouldn't shoot me or kneel on my face or kick me while I'm handcuffed. They're trained not to do that unless they have perfectly good reasons to do that. Perfectly good.
I don't live in your country. Nobody here needs good cop videos because in my part of the world, even unpleasant encounters involving the police don't necessarily reflect badly on the officers involved. We don't have your kind of horror stories here.
We have shitty cops, certainly, some pretty racist guys. Just go and read some reporting on the NSU (Nationalsozialistischer Untergrund), it's our little domestic terrorism problem showcasing how terrible our police can be.
Do you really think that can compete with the terrible shit in your country?
People in your country hate cops so much because the good ones allow the bad ones to dominate the public Image. They hate them because the whole institution has systematic problems with racism, accountability and excessive force.