It has nothing to do with race. If you pull a gun on police when they confront you you are likely to get shot, white, black or purple.
I think the protesters are racist because they react only to the shootee being black, and not the facts of the shooting.
If the citizens of Chicago actually trusted the cops not to lie about the circumstances of a shooting then their protests in this case would be a lot harder to understand. But since we know of a couple of recent high profile cases where the cops straight-up lied to cover for a murderer in their ranks, it doesn't take much brainwork to figure it.
Chicagoans know the cops lie to them about why they kill people. And they don't like it.
Would you trust a Chicago cop not to plant incriminating evidence on a dead guy they just killed, when you know they have a history of doing exactly that?
Well, given the video - it appears what the cops did here was to plant a gun, holster and extra clip on the guy before they shot him. He probably was taking the gun out to say "wtf, how did this gun get here?"