In a way, of course, she's right, after all I've already noticed that the Death Eaters and the rebels display mostly the same behavior these days. But I disagree with one of her statements. Unlike her, I would never have lasted this long without my Occlumency. Simply "not thinking about it" doesn't seem like a sufficient explanation to me. That's not how black magic works, and certainly not the Avada in particular. You have to really want to kill to cast the curse. It takes a lot of hate and at the same time a certain mental strength to keep your soul from being torn apart by it. How this is supposed to work without Occlumency is beyond me, but obviously Granger is an expert at it.