No, uncertainty very much is a valid objection when you're manipulating the genome of a human being. Even from a purely utilitarian point of view you should at

No, uncertainty very much is a valid objection when you're manipulating the genome of a human being. Even from a purely utilitarian point of view you should at least be able to rule out the terrible consequences such an experiment could have. Besides even if a particular experiment cannot be done because the outcome is uncertain and we can't have certainty without the experiment then that is circular but not circular reasoning. We cannot simply declare something to be ethical purely because declaring it unethical would not allow us to do something.