[pdonis]

> I wouldnt assume that "quality protein" has any correlation with being healthy.

I don't see why not, with a correct definition of "quality". See below.

> Arguably meat eating humans would do well to include some amount of kidney, liver, marrow etc in place of some of the muscle tissue that we tend to eat a lot of.

Sure, if those items are all processed with the same level of care and attention to detail, cleanliness, etc. But because they are treated as "by products", they're not.