You’re being too gentle to the Thug. By going for Officer Wilson’s pistol, he was in the first stage of trying to murder Office Wilson. After all, what else was he planning, to take the pistol to the nearest AME church for a gun “buyback”? The whole thing was repeated attempted murder and the monstrous, subhuman Brown was justly, morally, and appropriately exterminated like the vile vermin he was.
Wilson took out the trash, end of story.