I don't disagree with your arguments, Kirt, except with the
below, which is not true, to my knowledge, and certainly
a generalized statement designed to support your position.
I've seen studies of chimps that have eaten virtually no
animal matter, and certainly do not go out of their way
to procure same.

"Even chimps do not apparently thrive without animal foods as
they go out of their way to procure them."