Life causes cancer, plaque build-up causes heart disease. Nothing was meant to do or eat or kill anything, that's just how life evolved. Again, I'm not arguing over moral stances, I think it's very admirable. But I mean, even just as mammals we've been consuming other animals for more than 200,000,000 years! The reptiles those first mammals evolved from probably ate animals, as the fish those reptiles evolved from probably did as well. Cooked meat is very likely the evolutionary edge that lead to what what we can sentience, it obviously "works" on a biological level. To argue otherwise is delusion.

If eaten in large amounts. Also, herbivore animals get cancer too.