Wow, the cop is a moron.
Erik, you can't excuse this. They could have easily apprehended the guy by following him with backup. Or they could have arrested him later. Yes, maybe it would have been difficult to find him but really, this cop just destroyed his life by getting involved in this and making a rash decision to shoot the guy in the back.
All cops should demand body cam and follow their own damn laws. This one bad apple will create more problems for cops. They really should wise up and not give the critics anymore fucking ammo.