I think human intentions do matter, at a qualitative level. And at a quantitative level, I hope we can agree that we're likely to kill fewer animals if we only

I think human intentions do matter, at a qualitative level. And at a quantitative level, I hope we can agree that we're likely to kill fewer animals if we only kill them inadvertently than if we kill them both intentionally and inadvertently. But even if you take a wholly consequentialist or utilitarian view (where the utility of animals gets some limited consideration), I would argue that eliminating (iii) through (v) is beneficial because it allows us to greatly reduce the animal suffering we cause, with minimal impact to our own wellbeing. In the modern age, pretty much no one needs fur, and certainly no one needs stuffed gorilla heads, and most people probably don't need meat. Steaks and mink coats are wasteful luxuries we can do without. However, getting rid of cases like (i) would require a great deal of effort, and getting rid of (ii) could block the path of medical advances which might significantly reduce human suffering from disease.