Every police shooting I have read detailed reports always has room for improvement. My use of force incidents always had some things that could be improved before the next time. After all we are human, we will make mistakes. We hope those mistakes are not big ones that cause undo harm to oneself or others.
Some people just hate the police no matter what. Many others don't know good police work when they see it.
I took an oath to not shirk by duty, not be a coward etc etc.
Police don't have the luxury of backing down. Yeah, some do and should be fired. Basically, that means don't give up ground you took. Common language used is we need to run to trouble when others will run away. Why? no one else will in most cases. We shouldn't run to our deaths. What's that mean, use caution and sound tactics even when facing a deadly encounter. Adapt and overcome.
To those who hate the police, if you get your way, it will be the military patrolling the streets. Yeah that work out, right. (not)