Because that would just be a different way of trying to say it's natural. Don't equivocate.
Yes but still, it can be taken that religions can also have natural basis which is expressed in a different way but still maintaining the sense. It is very important in understanding the cause and effect, related to any religion. Basis of few religion can be natural or prime whereas of other social or gross which can influence its followers accordingly. Other topic subject.
Hunting in a time of plenty is a net energy gain. Predators only have to conserve energy for the hunt when the hunt is prolonged due to scarcity. Once again, cause and effect -- and not a viable argument for ascetism being natural.
MPOVs can be there on every non absolute point. We need to better understand evolutionary outcome from availability of means in excess, normal or deficient. Evolutionary or inherent angle is very important for it not just temporary angle. We prefer good pedigrees--so develop and opt these. This aspect appear to have big relevance in developing good, normal and bad nature on any being and can be discussed in a separate topic. Such evolutionary or inherent acquisitions may also justify live & let live and might is right.
