The role of the mind as far as physical reality is concerned is in everything. All that exists; universe, divine, consciousness…anything to everything is because our mind says so and also because it is far too superior that we need not compare the mind to anything that we can conceive or perceive of.
Morality is the principle which distinguishes between right or wrong, good or bad…. again from the faculty of the mind with its power to choose between this or that. Morality is simply a method to assist the human mind to evaluate his choices and actions and ethics for that matter relates to finding out the means to define such a method. All this again is the exclusive prerogative of the mind. Here the question comes to the mind why does the mind need to judge such a code of value system?
The reason; the mind is primarily designed to separate the psychic energy into dualities in dichotomies to experience and realize what is life all about. This is the job of the mind, decipher between moral and amoral, for if one was not there the need of the other would vanish. Like if devil was not there, why would we need God? This series of experiential realization gives rise to what we call as consciousness via the medium of awareness.
The answer comes from Shaiva Sedhanta in contrast to Advaita Vedanta. Even though both are based upon the philosophy of non-duality as the absolute; the former claims both jiva and ishvara are real, for both have the absolute as the content and the latter considers the manifestation of jiva to be an illusion and unreal.
If the mind can be made to be aware of such a centralized philosophy to accept both dualities with equal grace and respect, good and bad or right and wrong as One the question of morality and ethics would not emerge. Shiva stands for unity and oneness.
If the mind can be used more in observance and watching rather than cutting and choosing between this and that, then yes, the need for morality will reduce. Animals not having this distinguishing power of choice are thus limited to not knowing anything about ethics or morality.