You make a fair point[1], but I'd still like to know about the prevalence of this. Not saying I don't believe there's a problem, but I think that media reporting is skewed towards sensationalism, and any kind of misconduct makes for clickable news.

In a country with more than 300 million people, there's bound to be bad ones, and some of those will become cops. I'd be happy if you could point out some comparative studies between countries, that take this into account, but I guess that's something I could just search for online

[1]: so do the other replies