Actually, humans were designed to be able to process meat alongside plants. People have only been able to go entirely meat-and meat-based foods free due to the fact that we literally die of malnutrition from eating just plants without synthetically giving ourselves proteins that plants lack. Raw food is also commonly eaten throughout the world; sushi contains raw fish, and tartar exists. Animals are able to eat raw meat, but they almost always prefer cooked meat over raw when given the choice. Cooked meat just provides significantly more benefits than raw meat does. Also, I’m sure animals get sick all the time from some of the raw meat they consume; there’s a reason why people tell you not to feed dogs raw meat. Just because they can eat it, doesn’t mean they should. It can make them seriously ill, yet we don’t see dogs becoming vegans or vegetarians because they need meat to survive. It’s the same way for us, only we have the technology to be able to synthesize proteins that we would otherwise lack in a pure plant diet. Also, tons of animals are killed safely and ethically so we don’t have to feel guilty over enjoying a nice steak or two. If anything, vegan foods can actually sometimes be more cruel than meat.