Stop an think about that for a moment. If there is no need for the police to determine if a threat to their safety exists then what is to stop them from shooting any and every suspect on sight?
If police are using deadly force then isn't it kind of important for them to have a reason for doing so? If the suspect is unarmed then why the need to shoot him?
“If the suspect is unarmed then why the need to shoot him?”
If you are innocent, why are you running away? If you are unarmed, why aren’t you obeying commands from people pointing guns at you? The time to find out if someone has a gun is not after they have shot you.
Same logic. If two guys walk up to you, point guns at you and say “Gimmee your wallet”, that’s a bad time to start a debate on justice. Give them your wallet or run but never try to reason with people pointing guns at you.