I think too many people are missing the point.
When you get out of the cop car guns drawn, that automatically escalates the situation. I'm not sure what call they recieved, but when they pulled up, dude wasn't posing a threat to anyone. That's my biggest problem here, that cops take this 'shoot first, ask questions later' mentality when it comes to dealing with us.
Sure dude was in the wrong. Whether it's the cops or anyone else, if they have a gun drawn on you it's YOUR responsibility to act appropriately.
I'd be more sympathetic with a private citizen who killed like this. Call me crazy, but I expect guys paid to handle these situations to handle them more diplomatically. Let's say the call they got was the belligerent man may be armed & dangerous. In that case I completely understand drawing their firearms. However when he's pacing yelling 'shoot me now motherfukker' I'd expect trained officers to attempt to diffuse the situation. A response like 'I don't want to shoot you, I want to talk to you' would be more appropriate. Attempt to diffuse the situation instead of stoking the flames. I feel like they make those attempts when it's not US they're policing and that's my biggest problem.