Medical errors, for example, are estimated to cause as many as 250,000 deaths per year [1].
There are millions and millions of daily interactions between police and civilians every year. Sadly, there will be some mistakes, some of which will be caught on camera.
It's important to be aware that what the media can be random, and media coverage is not always correlated with how important or prevalent a problem is.
[1] Johns Hopkins: https://www.hopkinsmedicine.org/news/media/releases/study_su...
[1] - https://www.statnews.com/2016/05/09/medical-errors-deaths-bm...
But of those 250,000, some will be small mistake, and some will be epic fuck ups (see [1]).
Similarly, the police shoot around 1,000 people per year. Of those, many are justified, some are are questionable, and a few are epic fuck ups. If you just look at the epic fuck ups, you may believe that policing is completely broken in America. If you look at it in context, you'd probably conclude that the system works well in some cases, not well in other cases, and that there are lots of tradeoffs and no easy answer.
I'd recommend Peter Moskos's blog and podcast (www.copinthehood.com and www.qualitypolicing.com) to get a more even handed perspective than you'd find in the media. I'm not defending every single police shooting, but I think the recent shift in public opinion is not based on a good understanding of policing in America.
[1] https://www.mdlinx.com/article/jaw-dropping-medical-mix-ups/...