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...
I think the issue people are rioting about is that it's not a 1 in a billion chance for everyone. It's more like 1 in a quintillion for a rich white person, and 1 in a million for a person of color. That inequality stems from systemic racism in the police force. What you're saying is that it would be less of a problem if the deaths were evenly distributed across the population. That may be true, but I don't think many people would suggest it as a viable solution to the problem.