It's hyperbole. Millions of citizens interact with police on a daily basis and don't get shot. That obviously doesn't excuse the cases where it occurs, but it's not like this happens on a significant number of calls.
Once we define what kind of encounters to sample, specifically encounters involving police breaking into your home, it's no longer a ratio of 1:1000000+ that you will have a bad encounter.
If I were told the chances of me dying from jumping off a cliff were 1:1000, I still wouldn't jump that cliff.
