“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.
Why didn't the police shoot him the moment he started running? If having a weapon is no requirement to being shot in the first place then why wait? Why make the police run and get all out of breath and all? Shoot the suspect on sight.