>"It exists in nature" is not a solid argument for anything. I've read about insects that coerce their mates into copulation under threat of predation. Yet nobody seriously argues that humans should be allowed to rape because rape exists in nature. Such an obviously sociopathic argument just doesn't fly.
It's worse than that. Some insects (I think it's mantises) will murder each other after copulation. I'm not sure what the evolutionary advantage there is, but this doesn't seem like something humans should emulate.
>How about we make humane business models a pre-condition for existence?
No, because too many people don't want this.