Cops need to really be better at threat assessment. A few years ago a cop in Seattle killed a deaf man on the street. The man had a closed knife on him.
It was very much an over-reaction by the cop. The man was making no threatening gestures. He was just walking.
https://www.youtube.com/watch?v=5mvLw2ksPz0 This is an extreme example, but again just like this lady the force is a crazy point past being acceptable for the situation.