This is in no way new. Police all over have been abusing thier posts since the inception of a police force. Here in Utah less than a year and a half ago an older Tongan man was shot because he walked up to a car that was parked in front of his house in West Valley City and had two suspicious men in it and he was shot by the officer in the drivers side because they said he brandished a weapon. The guy was wearing a wrap. The only thing he was concealing was his dick.
The officers must have freaked out. Either way deadly force is often used by officers in the line of duty and you cannot hold the entire countries police forces responsible for the actions of a few sick individuals.