a few bad apples spoils the bunch
They have much more power over the lives of others than a normal citizen, including life and death. I don't take issue if something bad inadvertently happens but when something such as this happens I do take issue. I think it's important to hold police to a higher standard as they have been given power and responsibility that I believe warrants such scrutiny.
In this case you can see the officers pull up and get out of their car walk over and shoot the guy standing in the middle of the street. All happens in just a few seconds. The police said that the man charged them with a knife but you can clearly see that he is standing in place with his arms at his side.