This is one of the most important points to me, and I rarely see it discussed. Defenders of killings by police usually point to the officer's feelings of safety

This is one of the most important points to me, and I rarely see it discussed. Defenders of killings by police usually point to the officer's feelings of safety and right to defend themselves using what seem to be the same standards as any average civilian. If you gave me a gun and put me in a dangerous situation I might pull the trigger when I didn't absolutely need to out of fear, and it might be totally reasonable for me to do that. That's why I'm not a police officer. We have a profession where part of the job description involves the possibility of shooting civilians to death, and we are somehow unable or unwilling to get tough and establish a bar of professionalism commensurate with such an extraordinary job description.