Meat is the best place to get all 9 essential amino acids to make a complete protein. We can get this from other food sources yes but they arent easy to cultivate nor do we have the means to cultivate them to provide 7 billion people with all of the incomplete proteins to make a balanced diet. Meat is easy to produce, wholesome, and natural. So long as the animal is not unnecessarily injured in the butchering process i have no qualms with eating meat.