In all fairness, they do allow for the possibility that some other, unspecified factor could cause the early death of those who eat processed meat. Some commenters point out that the more meat you eat, the less fruit and fresh vegetables you are likely to include - meat is pretty filling, after all. There are almost certainly also other lifestyle differences. For instance, hot dogs and burgers tend to go with a stressed lifestyle and a poorly develed home/family life. And you won't find many long-time meditators dipping their face in the meat sauce.
Still, REVENGE OF THE COWS! Woo! What an adorable topic.