1) It would be nice if some of you could grow up enough to speak about the article rather than making it about yourselves and getting your jollies off by insulting each other.
2) The issue here is the exact same as it has been in all the other cases: police officers are not trained to de-escalate situations or to seek out non-violent means of handling incidents first and foremost. The partner clearly pulled his gun almost immediately upon hearing a noise nearby, and opened fire on the victim before ever identifying himself as a police officer or assessing the situation.
3) It would have been grand if from the start movements against this had focused entirely on police retraining in general rather than focusing on the issue of race. It doesn't matter if you're dealing with the most ass backwards, hates his own clothing because it's the wrong color racist in the world if the training is designed to use violence only as a last resort. The training is extensive, and when trained properly people follow that training even during stressful situations.
4) People should not be surprised that the reaction changes depending on who the victim is. Our brains literally react differently when we relate to a victim and fear is the emotion we feel rather than simple unhappiness at the injustice of a situation. People are only so far from the baser instincts that underlie our calmer day-to-day selves. Seeing a victim that looks like you or someone close to you will almost always elicit a more visceral reaction. Rather than trying to shame or make a spectacle out of that fact, it would be nice if the media would try to help people understand one another. Sadly, it's all about sensationalism.