I had a viral reaction of approval of that last scene.
Black men have that gut reaction of rage and a thirst for revenge when our loved ones are murdered, especially when it's at the hands of an enemy, ESPECIALLY when that enemy is the police. And we don't want to stop and reason "well this guy maybe affiliated with the killer but he didn't commit the act." No, we want our pound of flesh right here, right now.
Not only did John Walker do just that, but he immediately avenged the death of a black man. I knew from the moment I saw Lemar Hoskins in episode 1 that he was going to die because Hollywood loves using the black friend's death as the white lead's motivation but just as I was getting annoyed with them showing his lifeless body, a white man punished another white man who was partially responsible for the death of a black man. And isn't that what we've been asking for for over half a century? Some type of justice?
John Walker just got more profound character development in a few seconds than other characters have gotten over multiple MCU films.