Have you studied the law on self defense?
Have you read the statutes on what constitutes murder, manslaughter, and negligent homicide?
It does not sound like it.
Not reacting to a police officer, acting violently and erratically while armed with a knife make a person a deadly threat. Being within 15 feet means he satisfies police training about how close a person with a contact weapon needs to be, to be legally considered a deadly threat.
The number of shots would make a difference, depending on the timing. Fired very rapidly, it doesn’t make much difference, because the question is, were the first shots justified?
I agree that the video looks bad. That is why I said it might be manslaughter or negligent homicide. But first degree murder?
Acting violently with a weapon and failing to follow police commands makes a person a deadly threat, and very likely to get shot and killed.
This case is marginal, but only because the movement toward officers is marginal, and the timing of the shots is marginal. That makes a case for the officer overreacting and for manslaughter or negligent homicide.
You see the same sort of problems with non-police shootings.
Much depends on what the officer knew and how he had been trained about deadly force and deadly threats.
The change in venue makes sense because, as you have noted, everybody in Chicago has already tried and convicted the former officer.
You are very wrong. And this evil beast masquerading as a cop is going to hell but stopping in jail before he gets there.
If he is following his training, that may stop him from losing his pension, but it will not stop him from going to jail. Bad training is an excuse for unions, but not for juries.