The pair of police shootings this week will make the upcoming DNC much more interesting, I don't doubt. By far the more disturbing case was that of Philando Castile, who had a concealed weapons permit and had informed the officer of that fact. The officer shot him while he reached for his wallet to produce it, as well as his driver's license. What makes the case most disturbing is that the officer then held him at gunpoint while he bled out, making no effort to render aid or assistance to the dying man, nor to verify his story by calling in his IDs, nor to do anything except wait for backup.
For me, this underlines the point I've made about these shootings in the past: they are about the way we train police officers, and teach incoming officers to think about their relationship to the public. The incident makes perfect sense if you follow the logic of the training. If the most important thing is to protect the officer's life, then you shoot as soon as hands go for something unseen. You don't render aid or assistance until you have full and complete control of the situation. That cannot happen until all the other parties are secured, i.e., handcuffed or locked in police cars. When there are multiple other parties (here there was a girlfriend and a 4 year old), the only thing you can do is maintain watch with your weapon covering the unsecured members of the public while you wait for backup to arrive.
Only then can you take steps to save the life of the man you shot.
If you watch the video, you can hear the upset and tension in the officer's voice. He's very highly strung on adrenaline and fear of what he's just done. He's not thinking straight under these circumstances. He's going to follow his training, and this is how he's been trained.
Which means that he, like other police in these cases, will walk. He will be found to have acted appropriately, because he will have done just what he was trained to do.