I don't think that's what causes police killings unless you consider walking out of your friend's house with a cellphone in your hand making "10 of the worst decisions of your life in a row"[1]
Exceptions exist to every rule, and spending your life worried about getting struck by lightning is a terribly miserable existence.
Besides, I could probably go over the incident you’ve linked and point out all the bad decisions the person in question had made up until that point, but frankly I’m too lazy to even open the link to hold your hand through this process of critical thinking.
[1] https://en.wikipedia.org/wiki/Killing_of_Andre_Hill#Incident