Humans are ominvores and eating meat is one of the things that helped us develop big brains to dominate the planet.
As they say, I didn’t climb to the top of the food chain so I could eat carrots.
Ever notice how “cults” will cut off meat protein from new recruits diets?
Makes people easier to control.
Just like you said. Meat protein increases brain power.
You don’t need brain power to “outsmart” and “sneak up” on a carrot.