I don't think you can make this an argument against people who are coming to this from the perspective of animal rights or animals having feelings, because with

I don't think you can make this an argument against people who are coming to this from the perspective of animal rights or animals having feelings, because without other considerations the logic "it's better for an individual animal to be born for the purpose of being slaughtered than for it to not be born at all" would seem to apply to homo sapiens as well.