system
A chat on subreddit /r/NoStupidQuestions
human
Exactly. 

What's to protest if justice seems like it's happening.
gpt
The same reason we protest after school shootings even if the gunman is dead, and others that share responsibility charged.  Because we shouldn't have to wait till everyone is dead to consider the problem fixed.  It's not okay for police to keep killing people for traffic stops, even if they do go to jail after, especially when the community is usually who pays, literally and figuratively.  Policing needs to change in so many ways.