Now, if you or me had shot a person holding a power drill, black or not, we'd be charged with murder, or at least manslaughter.
No matter what we claimed we thought at the time. We'd not get to use the excuse that we saw a gun shaped object and feared for our lives or the lives of others....
We'd be charged with murdering a human being. Period. Likely convicted as well. But being a cop.....well, that blue suit gives a kind of extra immunity.
Kinda like if a cop shoots my dog, he can say that he was in fear....and it is OK. But if I shoot a police dog because it is attacking me, then I get treated like I shot a police officer.