How are the cop bootlickers going to explain this one? Coward ass cops always claim to shoot because they're afraid their lives are at risk, like everyone could be a secret ninja.
What he probably needs is a solid year of psychological assistance and guidance and help for the root antisocial, lack of empathy that he bears, but will he get it? We'll see. Until then, whatever the justice system of his area decides, the end point will be that the roots of this behavior will otherwise still exist in him for his remaining years, whether he goes to jail, just loses his job as you said, or becomes a wife-beater or something.
Let's say the guy in the wheelchair had someone pinned to the wall, and was trying to slash them, absolute worst-case scenario.
You can't just tip the guy's wheelchair over?