I would be willing to give 4 cops a total of 8 rounds.  Every shot after that moves ever closer to murder.  These cops may or may not have feared for their life but it looks to me like they were angry as h*ll and that is why they emptied their magazines into a suspect whose only crime may have been stealing a motorcycle.  

What's next, 120 shots into a bank robber, maybe 300 shots into a drunk driver after a fatal accident?  As I said above, any more that two shots each is hard to justify, and emptying a magazine into a suspect is murder.  How many shots is a speeding ticket worth?   

In the US criminal suspects have a Constitutional right to a fair trail, except in the 1200 cases every year when our police execute them rather than arresting them.  

How many suspects have the cops in Europe executed in the last decade?  11,860 less than in the US.  How do cops in Europe arrest suspects without killing them?  Obviously something our cops need to study.