Regarding that last sentence, we won't know all the facts until there has been a proper independent investigation, you are selectively citing one version of events, one that makes the police's actions look reasonable. There are various other contradictory "facts" at the minute, such as people saying he was wearing a denim jacket (not padded), that he didn't jump over any barriers, and that the police never identified themselves. It's perfectly possible the police were trigger happy in this incident, we'll have to wait and see which could take months or even years.