How is it illegal? If you come at a guy from behind and tackle him in the way that his knees bend in the right direction it's not an illegal tackle. You're getting upset because at the same time that tackle happened, another NO player tackled him from up high resulting in him getting contorted. By the letter of the book, it's a legit tackle. Football, by nature, is a violent sport. Those tackles were doing what they were supposed to and getting to the quarterback in a legal amount of time and knocking the stuffing out of him to give their team an advantage.
Maybe you're not used to seeing it Buffalo, as our DEs suck and never get that kind of pressure, but we'd all be hailing Maybin and Schoebel if they threw a hit like that on Brady, Sanchez or Henne.