The questions of why shoot instead of tazer, and why 4 shots, both still need answered.
ALL police need held accountable for ALL their actions, and sometimes they, like all humans, make mistakes. Unfortunately, far, far too many people want to label those mistakes as something else, to benefit their own agenda. This appears to be one of those times (although I read where several "stars" have deleted their original Twitter posts regarding the incident). EVERYONE should wait until ALL the facts are known before making any judgement about this, or any such, incident.