I'm sure it would have been, but I'm not sure how much Wakanda cares. It only recently started even interacting with the rest of the world, and as T'Challa said before, "let them try" if anyone wants to invade Wakanda. Though, one wrinkle in that: who is in charge of Wakanda right now? Is it still supposed to be T'Challa? Because while I can easily buy the Dore giving zero ****s about killing Walker, I feel like T'Challa would take more issue with their actions.