Evolutionary fitness (or lack thereof) would quickly establish a pecking order - a hierarchy among thieves, if you will. The less robust creatures would rapidly die out/migrate/modify their nutritional mosaic as to diminish the initial aftershocks of this upheaval.
Regressing to a feral state is not an immediate thing, and would likely require social adaptation to appropriately finance from a short-term outlook.
What is biology, but cellular adaptation to adverse stimuli?
I don't necessarily agree or disagree with your premise, but find this insertion maladroit to your earlier point on instinctual utility.
Your personal investment is apparent as an extension of your earlier commitment to a vegetarian lifestyle.
Reason's as a non-vegetarian lifestyle.
I don't know where "honesty" comes into play here.