If humans arent designed to eat meat or that eating meat is wrong. Why do all cultures include fish in their diets? Now backstepping this retarded logic you have, culturally and historically, the tallest and strongest ethnic groups usually contain a moderate portion of meat and dairy in their diets.

You can make a stark contrast with in terms of height and body strength between different parts of the world.
Specifically in south america and most of asia they culturally didnt consume much dairy or red meat at all, mainly plant proteins and vegetables.

The ethnic cultures that consumed the red meat and milk from cows, sheep, goats, pig, deer, etc are much leaner and taller such as europe, the middle east, and northern africa.

Red meat contains essential nutrients like vitamin B12, and fish with omega fatty acids.

Even though hitler was a vegetarian qnd created the first humanitarian laws for animals. He still incorporated meat into his diet such as liver, sausage, ham, and game instead of constantly supplementing his nutritional deficiencies