Juries are told not to focus on the shooting, but to think if the officer believed his life was in danger. If the officer thinks his life is in danger its acceptable use of force under most department policies TO KILL YOU.

Most people in stressful situations do not follow orders well, people are not trained to "jump" on yelled orders. Barking orders at a confused/drunk person is the worst thing you can do. People are not trained to even think about their hand location except while pulled over, hands on the steering wheel.

But, we also do have criminals who do go for weapons.

I guess we just need better training and to have cameras, because each shooting is different, could be bad cop, bad training, bad situation or justified, nobody knows.