Its isnt the Police's job to punish. It is there job to educate, dissuade, prevent and to catch. The CPS, Judges and ultimately, we as Jury members, punish. Having got him on the floor, the additional tazering and the beating were revenge not a necessity. If he was guilty of GBH he is now a victim of GBH and on film, and will no doubt use that to full advantage. The Police are naturally conservative and authoritarian, thats their job. This can easily became oppressive and dictatorial if they are allowed to step outside the law themselves.