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There is seemingly no biological benefit to acting with conscience; if there were, only moral individuals would survive and procreate. Sadly, we know that's not true. The benefit of conscience is that you won't suffer guilt (private) or shame (public), and that by your own self-imposed definition, you are a moral human, a special kind of animal who takes unique pride in elevating him/herself above the termites.

Dr. Laura Schlessinger (2009). “How Could You Do That?!: Abdication of Character, Courage, Consci”, p.25, Harper Collins
There is seemingly no biological benefit to acting with conscience; if there were, only moral individuals would survive and procreate. Sadly, we know that's not true. The benefit of conscience is that you won't suffer