The states or cities where most of theses cop's are so fearful is in places that have strict gun control.
States that allow Constitutional carry have far less cops shooting people. Why?
Probably because the police are better trained, because so many people legally carry guns and because the public is armed and if they rioted, it would be a very bad day for the police.

Slaves are not armed and can be treated any way the police, (government) wants to treat them, Free men and women are armed citizens with rights and they must be respected.

Now do you understand why they push so hard for gun control? It is not about the guns or violence, but about making you into slaves.