Marino and Reiss will present their findings at a conference in San Diego, California, next month, concluding that the new evidence about dolphin intelligence makes it morally repugnant to mistreat them. It is morally repugnant to mistreat animals regardless of the intelligence of the animal and being a scientist has nothing to do with making such a judgment, since it is not a scientific judgment but an ethical one.…
The article is not discussing the ethical question of "mistreatment", but rather that of legal rights. This is an important distinction. Anyone can advocate for dolphin rights, but, as scientists who have done research on dolphins, they are in a position to make ethical arguments against keeping dolphins in a zoo for public entertainment. The rationale behind these arguments are grounded firmly in science. You have t…
By saying that this gives this puts them in a position to make moral judgements you are implying that these traits (basically, intelligence or some flavour of it) are the basis for granting a moral consideration. That is one giant implication to just rely on without even mentioning. That is something these scientists are not in a special position to comment on.