Animals will gang rape and murder one another
Assuming we acknowledge that animals do not have morals—atleast not to our capacity —then would the terms "rape" and murder be applicable? Murder and rape are often defined as unlawful or a crime, are animals capable of being in such categories?
The universe- as I see it- is governed by forces- like gravity, natural selection, chemical reactions etc
Speaking of natural forces, I once saw a clip whereby an adherent of objective morality proposed that morality is as objective as gravity. When countered with the fact that without sapient sentient beings, there wouldn't be morality, while gravity required no dependence. The adherent objected the counter, claiming that gravity, like morality, requires 'agents' to express it. In the case of morality, these agents are the sentient beings (i.e. humans). In the case of gravity, these agents are matter. No sentients, no morality. No matter, no gravity(but a universe would still be possible, albeit matterless, it'll be there nonetheless).
Or at least- a God with the morals humans have been taught to have- by religion for one- ironically.
Can it not be argued that even with a god entity in the picture, morality is still subjective given it is subject to that god's will, who happens to have a will and clear preferences?
If we agree on morality as a subjective term, we must ask; immoral according to who, or what?
I think this is the part where we become "intersubjective" in our morales.
Simply, immoral according to us, the overwhelming majority. Take, for example, basing our morality on the collective understanding that suffering is to be—by all means necessary —avoided since we, as biological humanoids with functional neurons and a tendency of mental lows feel awful/pain/agony when suffering is inflicted upon us. If you're a masochist, you present a problem to this framework though.
Maybe on top of this moral principle, we add that human flourishing is always recommended for a similar line of reasoning.
But this could me problematic with populations with minority groups. But a rigid framework, maybe with exceptions, could still be made.