[Vaquero]

high grade animal protein increased our brain power and gave us time away from dumb grazing animals, to increase our intellect and ponder our next moves...which developed into science and art.

[Aevery_Freeman]

Very true, including the horticulture and agriculture necessary to allow vegans and their ilk that consume milk, cheese and eggs to survive.

It also provided leisure for music, dance and various intoxicants leading to self-awareness.