Well the story says the police have admitted they erred and a settlement is being negotiated, so I would say yes, we know.

Police in the US face an incredibly difficult task. In most western societies where guns are banned, in most situations the police can safely assume citizens are not armed, so in a situation such as this, or indeed most situations, they can comfortably approach suspects, calmly and talk to people to find out what's going on. But in the US they have to assume there is a high chance people may be armed. So they often stand off, point their guns, bark orders and threaten to shoot if those orders aren't immediately complied with. Then, often, when they are not complied with to their satisfaction, bang...