I wouldn't say they ignore it, but rather they categorically have decided that is an unethical justification. E.g. it doesn't matter if experimenting on patient

I wouldn't say they ignore it, but rather they categorically have decided that is an unethical justification. E.g. it doesn't matter if experimenting on patients without their consent saves more lives in the future, it is still wrong. Perhaps you might argue that this is an absolute position they can't really hold to for everything. But I think people prefer to find other ways to justify such cases.