You are looking at this from a all police are evil stand point and I am looking at it from the article which is clearly not a pro-police piece. I want to hear both sides of the story. There are times when the cops screw up and clearly need to be prosecuted, from the articles this is not one of them.
If you were an officer and you had a call of a man with a gun, the witness who made the call points him out, you make contact and he starts walking toward you with his hand in his pocket, he is belligerent and will not follow your commands and if clearly closing the distance and coming toward you.
What are you going to do? You have only a few seconds to decide, what are you going to do? Are you going to do the BS shoot him in the hand Hollywood crap or wing him in the leg? If you deploy your taser it may or may not take him down, they do not do so 100% of the time. Do you physically attack the man? If he has a knife you are going to the hospital at the very least or the morgue at the worst. Remember if you choose wrong you may not go home. Choose wisely.
Funny; I was gonna say, if you choose wrong, an innocent citizen dies. Silly me. It's really all about what's good for the cop, isn't it?