Nothing was ever black and white; not to Itachi who could see the dark red of the Sharingan. And then, Itachi couldn't see anything at all, which was, absurdly enough, okay with him. He didn't need to see in order to hear Sasuke's keen of terror, resentment, triumph and maybe, just maybe, love that forced its way to the surface despite the circumstances. Itachi thought, as the world dimmed, it was only fair; Sasuke used to do it to him. Sasuke would live, and he would remember; Itachi had made sure of that.
